In a gamble, I bought this volume controller from Amazon Japan and ended up with the same (wrong) potentiometer as everyone else: the thread ends just below the top of the panel and the nut is not usable.
I may try and order the last one; since it is deeper than the others, I am hopeful it would do the trick, but there is no way to be sure without potentially wasting yet another $20.
Would anyone be willing to give it a try, for science?
Worst case scenario, I guess one should be able to secure the potentiometer to the panel with superglue or tape from below.
Alright guys, i think i found a fix for this.
went to my local hardware store, looked through every piece of hardware, and narrowed it down to this rubber grommet.
It fits snug between the stem and panel. Might take a bit of work to get it in just right but it works. Vid of it in Action