Picked up one of these sanders and have a question about the fine tuning adjustment. I have the spring for the adjustment knob but no knob and washers. I ordered the knob but the washers are not in stock although it apperars they are according to the parts manual a 5/16 lock washer, two of them. I resume they are a standard hardware itme.

Question is I can see by the breakdown the washers go on each side of the spring but does the top washer sit on top of the drum bracket or underneath it? I suspect the latter but want to make sure.

Appreciate a response. Thanks