vacuum advance replacement...

["G. Benedikt Rochow" <rochow@segosf.hlo.dec.com>]

On my '84 5kS, I've determined by detailed exact testing that
the vacuum advance mechanism is defective (I sucked on it, and 
it didn't even try to hold the vacuum).

>From the diagram I have, I can tell it's attached to the distributor
body by 2 screws (or just 1?) from the outside, and a little
flat arm with a hole in the end reaches into the distributor.

My question: Can I remove/replace the vac. adv. unit just by
undoing those screws, or is that arm attached to something on
the inside such that I'll have to remove-from-engine/disassemble/both
the distributor?


TIA,
-gbr