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Can I assume then, that the large hole in the strap be could be cut first to set a given diameter for the tracking groove in the eccentric?Because the strap is bolted together, it could easily be taken apart and straddled around the eccentric (while the eccentric is still in the jaws) for testing the tenon (with side shoulder cuts already anticipated in the strap).
The only problem I see there is that the strap has to be flipped round in the 4-jaw to make these relief cuts if they are not correct the first time. Resettisng a part exactly in the jaws eadh time has never been a strong point for me.
Even if there is only one strap, it saves space.