[PaulProe]

I am having issues with the clear plexi wind wings cracking. The cracks begin as a slight crack from one of the screw holes and eventually grows to the edge of the wing.

Once that crack is established, it takes very little for the wing to crack all the way across and break in half. So far, I've gone thru two and a third one has now developed cracks.

They are coming from Finishline. The only thing I can guess is to maybe burnish the countersink with the screw in hopes of creating a better contact area. I don't think I am over-tightening but that is really hard to judge on a 10-32 screw.

Any other ideas on how to prevent this?

Paul