home made jig
Ken I decided it would quicker to just make one and show you instead of trying to draw it. This maybe took 20 minutes to cobble together just to show you. I would spend maybe twice that long to make a permanent one. The carriage bolts I used had the longest threaded portion of anything I had on hand. You may have to use reddi-rod depending on a few factors. I thought there would be more friction on the bolt threads than there is so when you are ready to set it you might want to put glue in the threaded holes to lock the bolts in place because once it's set you don't ever want it changing again. The small wooden blocks on the ends of the bolts are to prevent metal to metal contact. Use a drill press to drill all the holes if possible. Nothing much on this jig is critical except when it comes to setting it to just make contact with the existing knives. Not much else matters which makes the rest of the build simple.
Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.