On the Porter Cable web site you can download a parts and service notes for the PC7424. Underneath the parts diagram it talks about using a washer to help fine tune balance:



"A flat washer may be used under the head of one or both counterweight screws (Ref. #132) to fine

tune balance."



Anyone try this? Does it do anything? I wonder if the weight of a metal washer or two would add the same weight as the difference between the 5" and the 6" counterweight?