batman wrote on 03/24/17 at 08:02:21:The part #6 is the plastic washer ,Ace hardware carries the #4 washers in brass , even at sea level where the bike needs to be richer you should be running 2 washers.
If you are buying brass ones - check the OD. I bought #4 brass washers and they had too large of an OD, and would not fit into the recess in the slide.
One member on this forum had the same problem - he put the washers onto a #4 screw, tightened the nut down, installed the screw into his drill, then held the washers up to his grinder to cut down the OD of the washer. (I couldn't find the thread where he posted this solution with photos).