I replaced one on an old Williams 4949 with a NWSL. As mentioned by other people so far, I had to remove the gear from the axle and press it onto the NWSL axle. It wasn't too difficult. I used the puller to remove the gear from the axle and pressed it back on with a drill press which is not really the best way to do it. Same with the drivers. Again, not the best way to do it, but it worked.
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