That freaking screw-head is mangled on every Kalmart except NOS. Often it is caused by not relaxing the other adjustments. In evil mode I think Kalart built that part it to be broken.
Okay, enough of the doom and gloom. I have a spare and if it just happens to be pristine, it is yours. Gads, I've made enough from those POSes to do a pay-ahead. Tomorrow when I'm at the bench I will check. Don't keep your hopes high. Yet.
Oh BTW, the best screw drivers for many of these parts are precision 'gun' screwdrivers. They have the optimal width and depth.
Here is a photo of my old set. I am not a gun person, but I appreciate good tools.
You might have to use a locking needle-nose plier to remove it.
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