Got my JM Pro two weeks ago and my shotshell holders a few days ago.
I have crushed my thumb a few times.with the lifter.
I am guessing many people have tried this with mixed results, but I built three layers of aluminum tape over the lifter gap.
Seemed to work fine for about 40 practice loads. My guess it will fall apart on the second stage of my next match.
I will get this to C rums after my next match in two weeks.