Scott can answer this best, but I thought the Wallis bases were designed
primarily for road riding. Although, for trials use, they are the
lightest, and the bottom edges are smooth and don't cut your fingers.

As for bolts through the other kind of carbon base (that take a
traditional seatpost), I have always used regular, non-square bolts and
locktited nuts to attach the base to the post, and attach the bumpers.
No rubber shims. I would think that a soft non-brittle plastic would be
a better shim material than rubber. But hey, whatever works!


--
unisk8r
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