That also depends on the mouing system. Guess you will have a ring?
I have crazy ideas sometimes and plan experimenting with a pendulum as long as I have space under the sheet. If I ever do it I will try fixed first and then free swinging.
As far as I remember there have been posts about spreading weight out evenly on the down half of the sled and it was not recommended.
My router doesnât have any accommodation for dust collection. But that is a great consideration. Probably in the end Iâll 3d print some sort of cover and hose port. On the other hand a couple of bricks are a lot larger than a similar weight in lead.
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Boy, howdy! Having the weight in a smaller package is a good thing. Bricks are cheap, though, if you donât have anything better 
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no need for anything fancy, with the triangular kinematics setups, the sled
rotating doesnât affect accuracy, you just want the CG of the sled in the XY
plane.
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