Quoted from snowvictim:Oh, that's very interesting. So basically you bolted the t-nuts in by screwing in the bolt? I was going to go for the hammer method, but I might actually try this instead.
Be careful hammering. I hammered one playfield and had zero issues. Then a friend showed me how his inserts got loose because he was hammering the tnuts in. So since then I’ve used a contraption about like the one in the picture above.
Only downside is it puts some pressure on the tnut threads but that hasn’t seemed to be much of an issue. I did have to pop one tnut out and replace it but the second one went in easier.
Also it’s good to clean the clear out of the holes and edges of holes before driving in rails, posts etc. anything to help and make sure you don’t crack the clear coat.