Hi all,
I have an old Amati rotary valve tuba, more of it here: https://www.reddit.com/r/Tuba/comments/1gdj6hm/was_this_old_amati_an_ok_purchase_as_the_first/
Now the clock spring of the fourth valve has broken. I have disassembled the lever assembly and separated the problem lever/spring barrel from the shaft.
But how do I continue from here, how do I get the barrel open? I don't see any other way than to use a suitable sized piece of rod to push the center piece (the one with a star shaped hole at one end and round hole at the other) to force one of the barrel lids open. But which side should I try to open? And should I try to hammer it or use some kind of vise to push?
Also, should I try heating the barrel and cooling the lid to help loosen the joint?
Any other advice or suggestions?
Thank you in advance!
