July 2005
Delco window style distributor.

Fitted with a Pertronix it's performed admirably but I've never been able 
to get the centrifugal advance where it is supposed to be.  There is enough 
travel but it didn't come in fast enough.  It seemed there was no 
combination of springs and weights that would give me the total advance 
needed at the recommended 1600 rpm.  I have been getting close but even 
when I thought I had it right, it would seem to change the next time I 
checked.

Today I decided to try another combination of springs and went to very 
light tension that would still snap the weights back when I let it 
go.  BUT, when I put the rotor on it wouldn't snap back without help.  I 
loosened the rotor just a little and it would return just fine.  At first I 
thought that somehow tightening the rotor down was causing enough flex the 
advance plate to cause binding.  Realizing that there just isn't enough 
force to cause the metal plate to bend I looked at the inside of the rotor 
and could see a little shiny spot on the molded in bracing.  20 seconds of 
filing and the advance comes in quicker and returns to where it is supposed 
to be.