There is something different about the cam on the left side. All the ones I have seen have a double cam hump, one on each side, to give an in and out on each side.
You put the rod in and the web lays over the adjustment bolt to level the rod, and when one side, a half of x groove is done, you take out the rod and then put the other side in, and full circle the cam lever again.
Unless the jig was dropped and broke off one off the cams, it may not work the way it was original intended as the cam has to move the cutter in and out twice. so it may need some repair from whom ever buys it.
Looking at the pictures again, it looks like someone made a whole new end cap.
Herm.