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Some use much more complex bearing systems for side to side and fore and aft movement.
Thread dredge - Do you have any links for these other builds?
Thanks!
NotThamesWater-
This Facebook group was pretty useful
https://www.facebook.com/groups/415329188897706/?ref=share
Alan_tbt
They are the sandwich between the upper and lower plate. They are isolation mounts I think more typically used for soundproofing floors I think. They provide the movement of the top plate which is further controlled by two inflatable balls. Some use much more complex bearing systems for side to side and fore and aft movement.