Bob's Knobs iOptron 6'' RC Secondary Collimation Knobs
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Bob's Knobs iOptron 6" RC Secondary Collimation Knobs

£24.00✓ 2 year warranty

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In stock shipped 1-2 working days.
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About this product

Model:  bk_at6rc_sec
Part Number:  AT6RC

Replacement collimation knobs for iOptron / Astro-Tech / GSO / Orion / TPO 6" RC Series telescopes.

Bob's Knobs are the BEST option for tool-free collimation.

Simple to fit and easy to use.

Collimate your telescope without an Allen key or screwdriver!

Instructions are supplied but can also be found online as well as useful FAQ.

Images are representative and may not show the exact knob size / threads.

IMPORTANT: Please ensure the Bob's knobs threads and factory screw threads match before installation.

Knobs for iOptron / Astro-Tech / GSO / Orion / TPO 6" f/9 Ritchey-Crétien Secondary

Part: AT6RC
Fits: Astro-Tech, GPO, Orion (US), and TPO 6" f/9 RCT secondary (solid or truss-tube)

Knobs: Black plastic, 16 mm (5/8”) diameter
Threads: Stainless Steel.

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