|My take on the little disc is that it stops all the grease from running out onto the shaft. Every time the cup is tunred in a bit, a little grease is pushed past the disc.

You can test the vacuum advance by applying some vacuum to it.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!