I've had my Proto 1/2" clicker apart, and it's not too complicated. You might go to the Stanley-Proto website to see about if they'll service them. I know they're down the way in Conyers, GA.
Team Torque does a very good job and Stanley Proto in Georgia will also do them. You have ot go on the Proto web site and look under support for the address.
I had one fixed by Stanley Proto in Georgia. There was something busted. Which they fixed for free and then the calibration with shipping was about $60. It was one of their more heavy-duty ones that was pretty expensive when new and I thought it worth it to have it calibrated by them.