Richie:
Probably not going to like these ideas unless you plan on keeping the turn table 'forever'.
1. If you can find someone - have them remove the mounting tabs and reattach lower or on the bottom of the turn table or
2. Remove the tabs completely. Screw a plywood 'bottom plate' under the hole in the layout, cut out a round 'shim' from 1/4 plywood and glue the turn table in place.