In Reply to: Re: Distributor dust cover posted by Bruce (VA) on January 31, 2018 at 10:22:16:
"I've never got one to fit correctly with a gasket in the cap. Maybe they are just a bit off, but the choice seems to be gasket or dust cover."
My experience also. I've run a '51 without one for several years. Points do not fail any more often than in my 601 which does have a dust cover.