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Hi Rob. Sorry about the delay, but I had to head to the 'big smoke' for a few hours. On my focuser, the shaft the knobs attach to is stepped..ie: the actual shaft is slightly bigger diameter than the threaded ends of the shaft, so after making the arm (2mm aluminium sheet) I drilled the hole exactly the same size as the threaded part. A slight bit of filing so the arm slipped over the thread fairly snugly, but not too big so it slips over the bigger diameter un-threaded part. Place the arm on & just screw the focuser knob back on.
When I'm out viewing, I undo the focuser knob slightly to allow the arm to hang free, course focus on the object using the other knob, tighten the knob on the arm side to lock the knob, then fine focus! So in essence, the arm gets sandwiched in between the knob & the bigger diameter shaft, which locks the arm solid.
Hope I've explained this well enough.
Dave, yes it's just a little red globe mate. The beauty of it is it comes standard with most EQ mounts these days. The little variable brightness light that I'm using actually is part of the low power scope built in to the mount to polar align it. I just don't bother to polar align it this way so I unscrewed the light from it.
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