Is the cotter pin only held to the washers by pressure?
I put the target inside a box I made, with a clear plastic top to let the light in and 6 inches of rubber mulch behind a cardboard wall at the back to catch any misses.
this is great thanks for the share.So the slots in the washer are just so the cotter pin will fill a little more flush between the washers ??
Some lead shrapnel will still escape but I think it is less than 10%.