{"product_id":"bobs-knobs-for-celestron-925-sct","title":"Bob's Knobs for Celestron 9.25” SCT","description":"\u003ch2 data-mce-fragment=\"1\"\u003eBob's Knobs for Celestron 9.25” SCT\u003c\/h2\u003e\n\u003ch4 data-mce-fragment=\"1\"\u003e A. Knobs for C9.25 f\/10 Secondary with Standard Collimation Screw Threads\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/h4\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong\u003ePart:\u003c\/strong\u003e C9.25std\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e Celestron 9.25” (23.5 cm) f\/10 SCT versions with standard collimation screw threads. Not for CPC 925 or C9.25 with “Trifid” Faster or EdgeHD optics (see Items B and C below).\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eKnobs:\u003c\/strong\u003e Black plastic, 16 mm (5\/8”) diameter\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eThreads:\u003c\/strong\u003e Black anodized aluminum alloy\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eNotes:\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003col data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eSilver factory collimation screws have standard threads. Our hints will help you determine which screws are on your telescope. Make sure the knob threads match the factory screw threads before installing the knobs.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eThe factory dust cover will fit normally with Bob’s Knobs installed.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eKnobs include a set of long spacers so they clear the secondary housing lip.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eCelestron 9.25” SCTs manufactured prior to 2006 have standard collimation screw threads.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch4 data-mce-fragment=\"1\"\u003e\u003c\/h4\u003e\n\u003ch4 data-mce-fragment=\"1\"\u003e B. Knobs for C9.25 f\/10 Secondary (non-Fastar) with Metric Collimation Screw Threads\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/h4\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003ePart:\u003c\/strong\u003e C9.25metBO (black oxide steel); C9.25metSS (stainless steel)\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e Celestron 9.25” (23.5 cm) f\/10 SCT versions with metric screw threads (CPC 925). Not for C9.25 with “Trifid” Faster or EdgeHD optics (see Item C below).\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eKnobs:\u003c\/strong\u003e Black oxide steel (black) or stainless steel (silver), 12 mm (1\/2”) diameter\u003cbr data-mce-fragment=\"1\"\u003eThreads: Black oxide or stainless steel\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eNotes:\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003col data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eBlack Phillips factory collimation screws usually have metric threads, but some black Phillips screws have standard threads. Our hints will help you determine which screws are on your telescope. Make sure the knob threads match the factory screw threads before installing the knobs.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eBlack oxide steel (shown in photo) is for dry environments. Lightly oil the knob top and knob serrations periodically as an anti-corrosion measure. Stainless steel provides better corrosion protection in coastal or high humidity areas, or in places where dew or other condensation is common.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eThese knobs sit inside the tall lip around the perimeter of the secondary, so they may be hard to grasp with two fingers. Adjustments can be made using a thumb or finger against the inside edge of the knob.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eThe factory dust cover will fit normally with Bob's Knobs installed.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eIf your telescope has a factory-installed plastic cap over the collimation screws, it must be removed and set aside when Bob's Knobs are installed. The cover is cosmetic only and will not affect operation of the scope.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp data-mce-fragment=\"1\"\u003e \u003c\/p\u003e\n\u003ch4\u003eC. Knobs for C9.25 f\/10 Secondary with Metric Collimation Screw Threads and “Trifid” Fastar Housing\u003c\/h4\u003e\n\u003cbr data-mce-fragment=\"1\" data-mce-style=\"color: #666666; font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 12.48px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\"\u003e\u003cstrong\u003ePart:\u003c\/strong\u003e C9.25fst\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e Celestron 9.25” (23.5 cm) f\/10 SCT versions with \"Trifid\" Fastar secondary housing ONLY\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eKnobs:\u003c\/strong\u003e Black plastic, 15 mm (5\/8”) diameter\u003cbr data-mce-fragment=\"1\"\u003eThreads: Black oxide steel\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eKnobs with silver screws may come apart if they are over-tightened. We have developed a new design using black screws that have a stronger bond with the knob. If needed, contact us using the link below for free replacement.\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eNotes:\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\n\u003col data-mce-fragment=\"1\" data-mce-style=\"list-style-type: decimal; color: #666666; font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 12.48px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eThese knobs fit only the Celestron 9.25” f\/10 SCT with a Fastar secondary which has black Phillips factory collimation screws that are recessed into the secondary housing. These knobs will fit C9.25 Fastar telescopes with or without EdgeHD optics.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eCollimation screws on these telescopes are small with very fine threads. Knobs must be tightened gently (just enough to hold the secondary in place) to prevent damage to either the knob or secondary assembly.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eKnobs include a set of long spacers so they sit slightly above the rotary cover opening. The rotary secondary cover must remain open when the knobs are installed. The cover is cosmetic only and will not affect operation of the telescope.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eThe factory dust cover will fit normally with Bob’s Knobs installed.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Bob's Knobs","offers":[{"title":"A. C9.25std","offer_id":48195729195173,"sku":"fnf1787937260341","price":17.81,"currency_code":"USD","in_stock":true},{"title":"B. C9.25metBO (black oxide steel)","offer_id":48195729227941,"sku":"fdt1787937260342","price":15.73,"currency_code":"USD","in_stock":true},{"title":"B. C9.25metSS (stainless steel)","offer_id":48195729260709,"sku":"bte1787937260343","price":22.26,"currency_code":"USD","in_stock":true},{"title":"C. C9.25fst","offer_id":48195729293477,"sku":"bkx1787937260344","price":19.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0709\/0162\/9093\/files\/bobs-knobs-for-celestron-925-sct_1.jpg?v=1787937264","url":"https:\/\/www.urbanwares.shop\/products\/bobs-knobs-for-celestron-925-sct","provider":"My Store","version":"1.0","type":"link"}