Just my opinion on what to do:
1. Find the older solid brass washers that were twice as thick as the new style with dimples. I believe this will stop the problem.
2. Use a powder baffle that has its own part that acts as washer. Forget what they said.
3. Are you using a solid bar or an adjustable. Either way, take the bar out and put the powder end in first and see if the gap between the bar and the metal is too loose.
4. I put the dimples down since they act as legs to suspend the brass washer up into the frame of the MEC to prevent it from sliding with the bar. I am guessing instead of the thick brass washer some engineer figured they could cut the cost of brass in half by cutting the thickness in half and pressing the dimples into it.
Is not Convex to the top with the dimples down? I think your washer is upside down. My washers are convex to the top/dimples down.
I think your washer is placed concave to the top/ dimples up.
Just my $0.02.
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