Actually an easy fix. Hardest part is locating where the hole should be. Have it drilled for a 7/16"-14 thread then tap thds in, get a bolt or some all thread drill the end for 1/4"-20 thread. Cut the threaded end off to length needed to be flush or below surface. screw in a 1/4" bolt with a jam nut on it using red lock-tite on the 7/16 threads. Walla done. Just make sure the insert is flush, maybe file it flush.