Hi all, I recently upgraded to a National NRP resonator concert uke that I plan to play sometimes in an all uke band I'm in. Resonators aren't known for their feather weight and add to that the fact that they are slippery and you end up with something hard to hang onto, standup, and play. I've looked all over the net for how to attach a strap button to the bottom of the body and can't find anything, not even a photo of one installed. Is there a problem drilling into the body? Will a sheet metal screw work? Any help is greatly appreciated. Thanks, Rick