Glued-on hide head is loose enough to cause a wrinkle. Still produces surprisingly good tone but looks bad. It's time to thin the herd and I would like to sell it. Anyway to remove and re-install or tighten or replace?
Hmmm, the wrinkle be gone! The head is still sagging at the bridge but nowhere as bad as before. Must be a temperature/humidity thing. I will have to take it apart and inspect further, thanks for the replies.