Meade ETX 125 Telescope manual focuser knob modification

Step 3 Another scope drilling

To fix the knob in place I had to drill and tap another little hole in the plastic back of the scope for a small screw to match the groove on the back of the knob. After the initial assembling, I've also marked the knob's own set-screw position on the brass shaft and made a small groove for it on the shaft, to make sure it holds well and wouldn't slipper.