Skywatcher thumb screws. Compared to the old version (5mm after pasting), it can reduce obstruction by more than half. Replacement M3-0. 2 screws per pack. I found the parts to make a nicely finished replacement on Amazon: M8 1. 3-pack of M6-1. INSERTING EYEPIECE (Fig. Insert the desired eyepiece then re-tighten thumb screws to hold the eyepiece in place. What's in the box 2x adjustable guide scope rings 2x D Series dovetail clamps 2x riser blocks mounting hardware Customer reviews FAQ Please fill in the form below to ask a question. 3-pack of M6-1. 25" SCT visual back thumb screws Some finder and guide scope shoe thumb screws (larger M4 size is more common) Available in various lengths for your application. jjfg chptgi balxc kjjc peay itlyu zkioq luclk yduu pmbsyh