Changing Volume control on JT30 Roadhouse

Hi, Greg.

I want to put a CM element into a JT30 Roadhouse body, but of course the volume control needs to be replaced with a more appropriate one. The factory volume control has that crazy threaded brass fitting held by the round brass nut on the outside. Is there a more elegant way to replace it with a "standard" volume control than drilling out the hole to allow the standard threads to be exposed? And if not, how do you tighten the nut down in that hole? I have one of your cool inline volume controls, but I was trying to make this "backup" mic a "stand-alone." If it's too much trouble to replace this VC, I might just leave it in and use is as an on-off switch (I'm not a big volume controller in general, anyway)

Or, maybe I should just be asking, "How much do you charge to do that?"

Thanks,

Mark H.