The front is held in by a metal wire clip, and sealed by a grommet which is really hard to find. Yes, it should pivot once the screws are removed, but probably very little due to interference with the fiberglass. IIRC I had to cut down a wrench to get in and remove the upper nut which is special but need not be. When replacing use standard hardware to make it easier.
Removing the reservoir is tough, and boiling water is a great idea. I drilled a 1/8 hole in the front of the MC right at the grove for the clip, then very carefully drilled through the clip so it had no tension so I could lift off the reservoir. I think I got a new grommet from Power Brake Exchange in San Jose who had my MC sleeved in brass (an S2 cylinder though I used it on my TCS). All moot though since I added rear discs the S2 cylinder didn't move enough fluid so I simply replaced it with a new 7/8 Tilton single circuit MC and replumbed for a single MC. Much less trouble bleeding and I get a firm pedal though a little more pressure.
Jerry Rude
4005R