Well I have a drill press and tools so what I was planning to do is drill
the hole directly into the body cap, but don't know if I can find a bit that
small after hearing the discussions. Taking it into the body cap would
give a good clean hole that wouldn't tear up every time you threw it into a
bag like aluminum foil would. Anything paper, ect would be destroyed the
first time you tossed it in the camera bag. I was hoping for something
durable enough that it could bounce around, be abused by banging into other
stuff in a camera bag, and still be totally functional.
The solid material being plastic I might be able to heat a needle and
melt a hole through it. Drilling would give the cleanest hole and I
suspect that would be key. The thickness of the material also could and
likely would be an issue I didn't think about.
Rather than aluminum foil, if I glued some cloth over a bigger hole,
fiberglassed over it, painted it flat black, anyone see any
problems. Would be thicker than foil, but likely much much
stronger. It would also be a pain to redo if damaged. Oh
well