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@dancing james
A couple of pages back I asked about removing seat tube shim from Ti bike. Just spoke with Ted James. His view is that many ti frames have thin wall seat tubes and are then shimmed and this is not a great construction technique. Frequently the seat tube isn’t reamed before the shim is bonded in so the shim doesn’t have a great fit. If the shim is removed and the seat tube then reamed it could well result in a weakened tube. Often the seat tube will deform a bit when top tube and seat stays are welded to it. Given the thin tube of the seat tube reaming off any metal might make it too thin to be structurally sound.
It was great to chat with him and he was really patient explaining it all in layman’s terms.