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Ease Collimation of SCT Scopes with Bob's Knobs

Precise collimation is essential to good performance for any Schmidt-Cassegrain telescope, but using a pointy screwdriver near your corrector plate and moving from one adjustment screw to another is just a little too scary and inconvenient.  Enter Bob's Knobs.  An inexpensive replacement for the stock screws on your secondary mirror that allows collimation adjustments without tools.  Visit Bob's site to order:

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