Assuming that this is a low cost experiment find (or make) a center weight that comes in @ under 8 ounces (this is quite low as far as record weights go and I have been succesfully using such for 20+ years on a belt drive Thorens TD125II).
Aside from the motor "added weight" can also hasten wear to the main platter bearing, which was my main concern when experimenting with much lighter record weights years ago.
I made the weight I still use today from an old/small Mapleshade brass cone footer centered and mounted to a 45 RPM Thorens record insert and the combo came in @ just under 8 ounces.
The lighter weight works well with the various platter mats I use and it definitely improves sound quality on LP's of all ages and thicknesses.
Been years since I searched for <8 ounce record weights, but they were around/available 15+ years ago.
DeKay