Join Date: Jan 2001
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From a cost standpoint, one deck plate of a given size can serve many different profile masts. Sounds like you want sort of a two-piece clamp-on ring, which would be specific to your mast profile.
Not sure, but I think Garhauer may have made some of these custom pieces in the past. If you can draw up what you want White Water Marine could also custom fabricate what you want. Cost in either case would be quite a bit more than a standard deck plate.