Okay, so I saw the picture. The little round piece is indeed a washer but I don't think it will be useful to you. It's a piece that is usually glued to the modern, necked sculpts and allows to attach them to the smaller neck pegs. Trouble is, it is probably too large for a Joe neck.
Besides, and at the same time it will reply to your last post, it will make the neck too short. The very first idea I gave you which is roughly similar to the last one in your post, was a bad idea. Technically, no problem, it'll work! But if you look at the picture I posted before, where it shows the inside of the neck, you'll see that those necks are very deeply recessed, so short pegs, and original Joe neck posts too, will make a short neck, thus awkward looking guy!
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