Rivet nuts could be part of your solution. I felt more comfortable mounting a backing plate with 1/4 pop rivets and then using the rivet nuts in the plate. My scotties have held that way for several years.

One tip... the rivet nuts want to spin if you are lazy with the installation. Drill the hole the right size and torque them tight.

https://www.youtube.com/watch?v=KeaMsvai0FA
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Mike Gilchrist