UPDATE - The smaller screw he sent threaded into the original thumb stud. The Al Mar's thumb stud is very close to the handle. In order to prevent the 'wave' from hanging up against the handle I had to trim some material off with a Dremel tool.

The modified wave works well.

I have some .jpg images on my computer but I can't figure out how to post them here.
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Univ of Saigon 68