Thank you for the helpful replies. What I am trying to achieve is a bass that's been properly re-graduated, given the general standards of acceptance. I had to ship the bass to have the top work done, so I'd like to make sure the bass is correct before it gets shipped back. I was not sure how important the edges of the back plate were, if I understand the above reply, they are not as important as the overall graduation of the back plate. The luthier feels the benefit of taking off the back and redoing the edges might be marginal. I mostly wanted to make sure that the work done is correct, for both achieving it's full potential tonally, and also for when the time comes that I might have to sell it. Thanks for the info on the tapping experiment too, have to try it. I'll work on getting the numbers on thicknesses.
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