I take the bushing and fill the bottom half of the threads that come in contact with the wood with epoxy. I take a short bolt with a stop nut on it and thread it into the bushing, up to the stop nut. I make sure I start the bushing square with the riser and screw it in. When I get it to the proper depth I back out my bolt and let the epoxy do it's thing. If there is a little squeeze out I just wipe it off and then back out the bolt so nothing gets into the threads.