Hiya Queg, I had the [
same scenario], bought a Virus Indigo second hand and found two of the knobs were wobbly when I received it.
I took a few photos. Here's a close-up of one of the Virus pots:-
[
Pot]
The part that is actually wobbly isn't the spindle itself, but the metal part surrounding the spindle that fixes the spindle to the base of the pot. I've highlighted it with a dotted line:-
[
Loose bit]
The only way to fix it is to physically replace the pots.
You can get the pots here (from Access-Music's hardware depot):
http://www.synthesizerservice.de/index.php?lang=en
Very polite and helpful guys. Send them an email, and if you want to do the repair work yourself also ask for pictures of the process corresponding to dismantling the Virus C (to get to the main PCB) as it can seem a little complex. The pics they sent me were for the Indigo (which, if anyone's interested, are here: [
1], [
2], [
3], [
4], [
5], followed by more photos of my own [
here]), so the process would be a little different. Yours
should be much easier to get into to do, as you have no keybed to remove before getting to the main PCB.
Below shows the
underside of the (Indigo's) main PCB, I've highlighted one of the potentiometer's "footprints". It's a six-legged pot.
[
Pot footprint]
Lastly, if the warranty has expired, then I guess the sticker on the back of the Virus serves no purpose.
Of course if you don't wish to do it yourself, get a trained technician or the synthesiser service guys at Access' hardware/repair depot to do it for you.
Hope this helps.
[edit: updated with links to photos]