It's not actually the power switch that broke; it's just the shaft of the cam that moves the arm that presses the switch. The same thing happened to mine and I fixed it by taking the sideplate off and using one of the long sideplate screws through the knob to hold the broken pieces of the cam together, and put the short switch-cam screw in the sideplate instead. A tiny dab of loctite on the cam screw wouldn't hurt, but you can't get any on the outside of the shaft or it will bind it (and don't forget to put the knob on, and you have to assemble it in the sideplate).
These generally break when they get too hard to turn, so before putting it back together, make sure the cam turns freely and smoothly. Mine had a teeny bit of corrosion in the shaft hole that narrowed it and created friction, so I reamed it out slightly and very lightly greased the hole and bearing surface on the sideplate, and also bent the switch arm slightly so it wouldn't hang up. I've shot a carbine match with mine since and it works great; the only problem is that I lost the detent ball (that clicks) when the knob fell off the first time, but the detent ball is not necessary for reliable function.
The one caveat is, you have to use a screwdriver that fits the sideplate screws EXACTLY, and you may have to use a scraper to scrape the paint/sealer out of the sideplate screw slots before you try to turn them.
More details in this thread:
http://www.theakforum.net/phpBB2/viewto ... ight=kobra
These generally break when they get too hard to turn, so before putting it back together, make sure the cam turns freely and smoothly. Mine had a teeny bit of corrosion in the shaft hole that narrowed it and created friction, so I reamed it out slightly and very lightly greased the hole and bearing surface on the sideplate, and also bent the switch arm slightly so it wouldn't hang up. I've shot a carbine match with mine since and it works great; the only problem is that I lost the detent ball (that clicks) when the knob fell off the first time, but the detent ball is not necessary for reliable function.
The one caveat is, you have to use a screwdriver that fits the sideplate screws EXACTLY, and you may have to use a scraper to scrape the paint/sealer out of the sideplate screw slots before you try to turn them.
More details in this thread:
http://www.theakforum.net/phpBB2/viewto ... ight=kobra
