I have found bass is OK if threaded inserts are used, but I make my own from flat head screws, 10-32s threaded 4-40. I make them a little (1/32") longer than the thickness of the mount then install them with the screw head under the mount and carefully file them down flush with the mount material. I use a dab of epoxy when installing. They don't pull out and provide a good hard point. Sometimes I'll use an aluminum pad but usually only if I'm making a universal plate that I can use to change engine types.
I found that the usual hobby shop type inserts don't hold up very well and are a disaster if used in harder wood mounts, they'll split out in a minute.