I'm cleaning up this old cornet which my parents bought at a flea market as decoration (a while ago, before I began playing the trumpet).
I've already closed the biggest air leak (still have to clean it up a bit), besides this air leak there are no other air leaks visible.
(The mouthpiece is a new one which I bought on thomann.de)
Is there a way to find the non-visible air leaks? And is it normal that there are no holes in the valves ?
I know this trumpet is junk but it would be nice if it's a little bit playable
Thanks in advance