
This overview refers to the smaller of the two keys. I didn't use the bigger one, the smaller one is complete junk. The knurled barrel you turn to adjust the cheek piece is not machined properly. The inner diameter of this barrel is too large compared to the shaft it is designed to spin on. As a result, the thread ONLY and sometimes does not touch the grooves in the moving jaw. This contact is the only thing holding the jaw in place. You can't apply torque to that piece of junk before the barrel-cheek interface slips. I also ended up applying green Loctite (an absorbent threadlocker after assembly) and hoping the nuts I was trying to tighten wouldn't come loose. the time will show

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