<VV> vacuum advance adjustment

[Jim Corey]

I've been off the group for awhile (like 1100 digests!!!).  Have time  (and need) for Corvairs again.

I set the idle and balanced the carbs on my 62 Greenbrier.  Nice even idle, approx. 650 RPM.  When I reconnect the vacuum hose to the advance, it pulls the advance, and the RPM climbs.  I recall (vaguely) an "adjustment"  --  using a socket and a hammer to change the diaphragm tension.  More enlightenment, please.

J Corey
'63 Corvair Convertible 
'62 Greenie
'64 Coupe
'66 Sedan
All running as daily drivers