Belt drive players are not designed for extra weight on them. Oh, they will handle 200 gm records just fine, I mean extra weight. Something to be said about record camps, too. If you are seeking smoothness, fine. For one who wants any "jump factor" forget it.
Turntable weight affects speed
I tried a Thorens tt weight on my Thorens TD-850 belt-drive tt. It noticeably slowed it down. It seems like extra weight on the bearing would affect any tt, but what do I know? Is a speed control (and strobe/test pattern) generally required to use a turntable weight while maintaining the proper speed?