The only issue I can forsee that will stop it being rebuilt indefinately is the silicon O-rings that seal it wearing to the point of leakage and the post insulator (silicon top hat) either scorching/cracking or being damaged as to start causing shorts.
The post insulators are available from the USA but the store says it dosn`t ship overseas

however being so small a package and of low value I`m sure I might be able to persuade them to post me some in a little airmail envelope
Other than that I suppose you can rebuild them until the threads wear out!
