Good practice in wood structures calls for a sleeve through the wood
(epoxied into place), slightly shorter than the thickness of the wood,
and large-diameter washers on each side, to distribute the compression
loads from the bolts. It doesn't mater if you have a block or a washer,
as long as there is a means of distributing the loads on the wood.

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I looked at the plans and there is no call for the sleeve. However I
like the
idea. It sure wouldn't add weight, but I do like the idea.
Lou