Spare Petrucci knob/ grommet?

[Cameron Himself]

So, I ended up tearing the rubber grommet on my tone knob when removing it. I was wondering if any of you fine people had a spare (knob or grommet)? I'll probably end up just contacting Customer Service, but I would prefer not to spend $7 on shipping alone, which is what they charged to ship a tone pot.

Thanks!

Cam