For stripped non critical screws/bolts, I usually just insert a small nylon cable tie thru the cover and into the threaded hole and insert screw. Then snip off excess if it doesn't cut/pinch itself off. Works great on coarse plastic screws.
I have also used a piece of small guage insulated wire, same deal.
" But let me tell you something ,folks: You can't fix stupid! There's not a pill you can take, there's not a class you can go to. Stupid is forever!"