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Bobs Knobs Collimation Thumbscrews

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Primary mirror springs as supplied by the factory can sag from the weight of the mirror cell. Our stainless steel replacement springs are stronger and provide adequate support to maintain primary mirror collimation.

Bobs Knobs Meade Lightbridge Primary Springs

ONLY £16.95

Fits: Celestron 11 (28 cm) f/10 SCT versions (metal or carbon fiber tube) with metric thread factory collimation screws and "Trifid" rotary cover Fastar secondary housing. Factory collimation screws are black Phillips. These knobs will fit the C11 with EdgeHD optics. They will also fit the C11 with Starizona Hyperstar if the collimation screws have metric threads.

Bobs Knobs Celestron 11'' Fastar Metric Collimating Thumbscrews

ONLY £18.99

Fits: Celestron 11 (28 cm) f/10 SCT versions (metal or carbon fiber tube) with flat secondary housing and standard collimation screw threads (not for CPC 1100 or EdgeHD)

Bobs Knobs Celestron 11'' SCT Flat Secondary Collimating Thumbscrews

ONLY £18.99

Fits: Celestron 11 (28 cm) f/10 SCT versions (metal or carbon fiber tube) with standard thread factory collimation screws and "Trifid" rotary cover Fastar secondary housing. Factory collimation screws are silver Phillips. These knobs will also fit the C11 with Starizona Hyperstar if the collimation screws have standard threads.

Bobs Knobs Celestron 11'' Standard With Fastar Collimating Thumbscrews

ONLY £18.99

Fits: Celestron 14 (36 cm) f/11 SCT versions with factory headless set-style (Allen or slotted) collimation screws
Knobs: Black plastic, 19 mm (3/4) diameter
Threads: Black anodized aluminum alloy

Bobs Knobs Celestron 14'' Factory Headless Collimating Thumbscrews

ONLY £19.95

Fits: Celestron 14 (36 cm) f/11 SCT versions with factory Phillips collimation screws with standard threads, with or without Fastar.

Bobs Knobs Celestron 14'' Standard Philips Collimating Thumbscrews

ONLY £19.95

Fits: Meade 10 (25 cm) f/10 SCT versions with three screws on the secondary housing (2120, LX10, LX50, LX90, LX100, LX200, others)
Knobs: Black plastic, 16 mm (5/8) diameter
Threads: Black anodized aluminum alloy

Bobs Knobs Meade 10'' f/10 3 Screw Secondary Collimating Thumbscrews

ONLY £19.95

Fits: Meade 10 (25 cm) f/10 SCT versions with six screws on the secondary housing (LX90, LX200, LX200ACF, LX200R, others). The inner screws are for collimation.
Knobs: Black plastic, 16 mm (5/8) diameter
Threads: Black anodized aluminum alloy

Bobs Knobs Meade 10'' f/10 6 Screw Secondary Collimating Thumbscrews

ONLY £19.95

Fits: Meade 12 (30 cm) f/10 SCT versions with three screws or four screws on the secondary housing (LX200, others)
Knobs: Black plastic, 16 mm (5/8) diameter
Threads: Black anodized aluminum alloy

Bobs Knobs Meade 12'' 3 & 4 Screw Secondary Collimating Thumbscrews

ONLY £19.95

Fits: Meade 14 (36 cm) f/10 SCT versions with 6-screw secondary and exposed factory collimation screws (Includes LX200ACF)

Knobs: Black plastic, 16 mm (5/8) diameter
Threads: Black anodized aluminum alloy

Bobs Knobs Meade 14'' 6 Screw Exposed Collimating Thumbscrews

ONLY £19.95
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