mounting cowlings
I observed what the big bird pilots were using on those huge cowls because I always had trouble with metal screws auguring out the screw hole from vibration. Many of them were using nylon bolts. On a fiberglass cowling, the vibration wear would be on the bolt and not on the hole in the fiberglass. I started using the nylon bolts and haven't had a problem since. I get 6x32 nylon bolts from hardware stores such as Home Depot or Lowe's.