Vintage Synth Repair

> Not sure if its some imperial size, all the metric ones I have (1mm /
> 1,5mm / 2mm) are either slightly too big or small. I'll probably try
> some torx precision screwdrivers next, those usually work with hex as well.

Just to "wrap up" here, I got this Matrix stuff sorted out last weekend 
(finally!). The way things went, a lot of drilling was involved and I 
ended up enlarging/threading all the set screw inserts for a slightly 
bigger (and most importantly, metric) one. More details here:

http://amazingdiy.wordpress.com/2011/11/18/matrix-12-control-repairs/

Finding a replacement potentiometer was actually rather trivial. I ended 
up using (the relatively standard-sized?) carbon track Weltron/Radiohm 
CIP20C potentiometers like these:

http://www.awatronic.co.uk/carbon-rotary-potentiometers-radiohm-cip20c-mono-/cat_184.html

As the shaft is plastic, trimming it down to proper length is a breeze. 
Installation holes in the lever mech had to be enlarged to 10mm diameter 
for these spares to fit. The shaft is also slightly smaller in diameter 
(I'm guessing 1/4" vs. 6mm -> .35mm difference), but thanks to set 
screws this poses no problem.

Nothing much else to say than what a fantastic and versatile synth! Too 
bad I won't be able to keep it in my music setup for good.. ;)

.Arto.