[GRutter]

I disagree with installing an insulating washer when installing the condenser.
You want a good tight electrical connection between the end of the condenser and the tang on the lower distributor plate assembly.

An insulating washer in this location does not contribute to a better electrical connection with the condenser.

Be certain that the screw does not bottom-out in the condenser to insure that you have a tight electrical connection.

I see that part on Bratton's site, but have never seen an insulating washer documented anywhere else.