Dave, the balls idea looks pretty good to me, as long as the holes they mate to are nicely smooth and even.
What I don't understand (and maybe it's for another thread), is that people go to a lot of trouble to make a big solid rigid pier, then sit the mount on a plate supported by four (relatively) little bolts. Surely those little bolts would allow a lot more flex and/or resonation than the rest of the pier?
Cheers,
Jason.
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