i had a simlar problem with a old drum of mine i ended up useing a 2 party ceramic epoxy i forget the brand name though i have also heard peoplr have sucess with thr normal PVA (polyvinyl acetate ) adhisive you can get from most hardware stores. Its mainly used for Vases and other ceramics so im note shure how it would hold up to the vibrations from drumming. The advantage is is is slower drying so you can align the peaces more presicly before they set

Talked to a potter friend of mine and here is how he does vase repairs and sugested ypu use a clear pva so it is less obvious
1
Apply PVA adhesive to the cracked edges using a small brush
Use just enough adhesive to cover the broken edges.
2
Applying light pressure, quickly press both pieces together for 30 to 60 seconds.
3
Scrape away excess adhesive with a razor blade or X-Acto knife.
4
Set the pottery down on a flat surface to dry overnight. If the item is broken into two or more pieces, set it in a large container filled with dry rice or beansThe rice or beans will hold the item in place while it dries


They used to be sold threw middle east manufacturing but they dont; seem to have any for sale atm.

IF he doesn;t read this first i will ask daveed how he repaired the broken one that he gave me ).

Looks like PVA to me then he wraped the outside with leather to hide the visible hairline

Emyrs