[Healeys] Vacuum Advance Diaphragm Housing

[Greg Lemon]

Elton, disconnect the vacuum hose if you haven't already, there should be a 
circlip or wire clip on the vernier fine adjustment wheel on the small end 
of the piece, remove this (without losing it if you can) and unscrew the 
vernier adjuster all the way off.  Take off the dist. cap and rotor, there 
is a spring that goes on a peg on the sliding plate the spring is what is 
connected to your diaphragm and adjusts your timing.  Anywho it just loops 
over a peg on the sliding plate, pull it off with a hooked wire or small 
screwdriver and the piece should just slide out.  Greg Lemon