Hi everyone - I hope someone here has successfully dealt with this problem before, and can offer some insights to help me solve this one. This is actually my own personal instrument (not a customer's), an 1870's German bass with a flat backplate that has developed a nasty warp in the lower bout over the years. This bass has been here in Las Vegas, in the dry, arid Nevada desert environment since at least the 1960's, and I only acquired it about 3 years ago after it sat warped, seams open, and unplayed for at least 20 years. We got it closed and reglued in 2012, and since then this bass has p