plate warping in 1877 Steinway B?

[Ron Shaffer]

I am assisting a technician who has replaced the
pinblock and board in a Steinway B. The frame has been
out of the piano for about 5 months. As we are fitting
it back in, it is not at all close to sitting tightly
on the front or rear sections of the inner rim. If I
clamp the front down tightly, the rear (tail) will
raise about three inches (the new pinblock is exactly
where the old one was). Is this normal? I was worried
that bolting it down that much would stress the plate. Thanks.

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