Stanron, are you saying that if a guitar is not subject to a heat source this wont happen? Excuse me im not trying to be difficult. The last two old acoustics ive seen have this issue, my neighbours and now my "new" old guitar. I expect my neighbours was as i found it in his garage. Mine, well i bought it online from a 2nd hand dealer who didnt disclose the bulge. Ive been looking at solutions and the thomson solution seems to be the standard.