Now you've gone and done it!!!
I have reversed many servos over the years, as well as modified them to turn a full 360 degrees (nice for propelling and turning a blimp!) over the years. Haven't done it in a while, because I haven't had the need....
I've got about 20 9202 servos. I will take one apart in the next couple days, and make the supreme sacrifice, and attempt to reverse one (I'll find a use for it, someplace) and report back here. I think it could be done, but I will let y'all know if it's possible, and if so, how hard it would be for the average person to accomplish. If it's really touchy, I will probably post it on my website, with instructions...
As for qualifications, I am an Electronic Technician, with a fair amount of SMT experience....
I LOVE a challenge!!!