Disc Brake Caliper rebuild

[<gschwind@charter.net>]

Hi, Listers
   Well, I'm back to work on the front brakes of my BJ8 that I started last 
fall. Due to a torn rotator cuff in my left shoulder, I've been almost imobile. 
May I have your advice on the following.
1. How do I get the piston through the hydraulic seal? Prior info says do not 
use a "C" clamp, do it with your fingers. So far I can't do it!
2. Failing to do it again, please recommend a reputable source who can rebuild 
both calipers in the lower Michigan or thereabouts area.
              Thanks in advance,
DON   BJ8   Pandora