anyone know where to buy a gain control **** that can be modified to fit in one of the TC factory knockouts under the steering wheel...

my local shop says he used the be able to make them all the time when they were metal, but the only ones he can get now are cheap plastic and he refuses to take them apart.

 

Not sure if this is what you're looking for, but there are several here on this website:
http://www.sonicelectronix.com/cat_i...--remotes.html

I'm using the PAC LC1

 

not sure how well it'd work on those knockout pieces....I mounted mine in the center armrest:

 

That's too bad, I'd think the guy would be missing out on some potential business. So, why not DIY? Just because he refuses to try, that doesn't mean it won't work.