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I think we are saying the same thing. In this case the nut is above the pulley. The washer is larger than the nut. If the washer is installed with the high part under the nut then the outside edge of the washer will be hitting the pulley.

A convex spring washer is used to hold a V-belt pulley tight. I assume the washer needs to installed so the convex part faces up towards the nut? In other words the raised center section of the washer faces up?

Well I ordered 120-3334 and that's what I got. I am now concerned with what washer or washers to put under the nut to hold the pulley tight. As I said the various serial numbers groups have gone between a spring washer or cup washer or both.

That's the pulley that goes blade to blade. I am talking about the V-belt pulley on top of that mentioned in your post.

I have this Timemaster mower and while I think it's a great mower I cannot figure out one thing. Serial number starts with 313. I have replaced the pulley on the blade shaft where the belt on it goes to the engine, the shaft, and the spindle. The pulley was held tight by a locknut and under...