Hi, Phill,
Errr...what I'm trying to say is, once dried, if there is more material on one side of the plug because it was not centralised, when the bowl is mounted it will have to be turned until an even wall thickness is reached. This is standard lathe practice, of course. But turning off more material than would otherwise be necessary will result in a smaller bowl, and probably a much thinner skin of resin, with the off-cuts on one side being larger (because, they too will have been chiseled). I think, what I'm basically trying to say is that there will be more wood exposed on one side than the other. With the cost of resin being what it is, why have to chisel more off than need be?
Bob.