Karl,
I did have to heat a couple of screws with a lighter to get them out. I did not put any thread lock back on them as it was still there. I have had no trouble with screws coming loose, knock wood. You will still have the old clasp if needed.
I also used to alternate between one and two 1/3 links on my bracelet, now I have no more removable links left, so the new clasp is slightly longer. I highly recommend the modification. Best money I've spent in a while.
Good luck,
Jud
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