OK thanks Nino.  I've put some of RTBB's bumper rings on.  They are a thicker material.  Mainly because the bumpers on the T2 get a lot of work!

I can understand the mylar twisting / tearing with over tightening posts.  Each one was checked when done up and only 'nipped
' a bit beyond finger tight.

The only other spot I may look at is the ball drops from the two ramps.  I don't think I've seen a T2 without wear on those to spots.