It kind of looks like posts on a piece of steel, there is one pictured in the factory manual. I have made one in the past for older bikes but haven't had to do a clutch on a newer bike yet so not sure if the other one I made will work or if I will have to make a new one. I have made many such tools like the pressure plate compressing tool to do the clutch on Later model Nortons with the same type clutch as the 73 850 Commando. I cut a piece of steel and threaded bolts through it then welded the heads fast once they were all the way through to make the holding tool.
EDIT: In the manual the tool is shown to be adjustable, the one I made isn't. The tool shown in the book uses a breaker bar or ratchet to hold it, mine had a handle built into the plate I cut to make the tool.
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