2Box wing nut screws for kit clamps stripped and snapped.

[peanutismint]

I finally bought a 2Box kit after owning the DrumIt Five for about 10 years. I'm a little disappointed with the design/construction, but for the most part it's acceptable. What's not acceptable is that after attaching some of the trigger clamps, not one but TWO of the wing nut screws (the little  thumb screws you use to tighten the clamps onto the bars) have stripped and come off in my hand. I don't feel like I was over-tightening them at all; maybe the previous owner didn't alter them much....

Anyway, I now have 2 clamps I can't use because the nuts have stripped. Anyone know if this is a regular problem and whether 2Box or somewhere else offers replacement wing nuts to keep my kit together??