I posted this a couple of days ago over on Cymbalholic. However, since the recent software update of that eminent forum, it has not been working so well, and, consequently, there has not been a lot of member activity over there. Since no-one has answered my question on Cymbalholic, I post it here as well.
Let me just add that I have been using calf heads for about two years now. I have tucked several myself, but always from new skins.
So, below is my original query from Cymbalholic:
OK, so I recently bought some old calfskin heads from eBay. The actual heads are in great condition, but they have all started to come loose from the flesh-hoop. I got them for a very good price, so it didn't really matter that they needed re-tucking. However, when I removed and tucked one of these heads the other day, I noticed to my dismay that much of the natural glue of the skin had disappeared with time and it was quite difficult for me to get the soaked skin to cling to the flesh-hoop. Eventually I succeeded. Compared to the new calfskin heads I have tucked, this old re-tuck didn't look too great. Once it had dried, though, it seems fine, and I have now played it a couple of times. It sounds fine, too.
My question: Are there any tricks of the trade to make it easier to re-tuck old heads with low glue content?
/Magnus