Help2 I have a 60s COB Slingerland with a Zoomatic that is losing tension as I play it. As I was cleaning it when I first got it, the rubber piece between the tension knob and the strainer body crumbled. The tension screw and strainer are made in such a way that the tension screw can't be taken out to insert another rubber piece easily - but you probably know that if you know how I can resolve the issue. I'm guessing the rubber piece is what was holding the tension. What can I do to make it hold tension?...slip another little piece of rubber between the knob and the strainer body, or will a spring between the strainer and shell do the trick? I'd like to have an idea of what to do before I pull the drum apart.
Thanks for any and all advice!
Lynn