Eric, you can usually find these old Kent-Moore tools if you ever need one.
Looks to me that J-21181 isn't real special, see attached pic from an ebay auction. Should be able to make do without it with patience and care or buy one on line if you think you'll need it.
Good luck Post up if you get stuck at any point.
I didn't think the tilt wheel cancel cam was reproduced. Do you have a source and p/n? Is it an exact match to the original?
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