Quoted from crashnt20:
I got the grommets to shim up the mini playfield and ended up breaking the screwes than hold down the glass. Not sure how I can do this with a screw driver but I did. Any advice?
I had to shim the lower playfied acrylic on my Luci Vault. It appears to me that the threads in the main playfield are T-nuts. You would need to either call Stern or remove the lower playfield to confirm this. If they are t-nuts you should be able to tap it out from the top and replace accordingly.