Chas, always a little movement but using end grain at least the rim won't cup. I prepped the pewter ring and then trued the laburnum rim and tongue just prior to epoxying the ring. I was trying to leave the bowl wall pretty thick to balance with the weight of the metal, about a 1/4 ". It's certainly a challenge to cut a thick green bowl with the pith included. The pewter's strong enough to not distort; the only danger is it adding tension to the wood as it dries. The growth rings in the laburnum were quite concentric which helps.
Hope that helps, drop me a comment on the blog if you have more questions.
I love the bowl and the pewter rim. Personally, I think the pewter foot is a little too "tall" for the bowl and if it was about half the height might be better proportioned. Overall, though, a stunning piece.
That answers my question I wasnt sure if pewter was softer, a bit like lead, that may have moved along with the wood.
Beautiful piece, (although I,m with Mike on the foot size) I hope the piece of Laburnum i bought last week turns out a similar colour.