Inorder to correctly reindex the intake cam for the Exintake mod, you have to drill a precision index hole 197.5' clockwise from top dead center.
Since I don't have a machine shop handy, I used my trusty 3d Printer to make a jig to aid drilling the hole.
this Jig can be inserted into the cam gear from the front or the back, and with a drill press will ensure the hole is precisely where it needs to be for the correct timing.
As a test, I first used the Jig from the front position, and made a small drill mark. Then I fipped the work over and inserted the Jig fulliy into the rear of the gear, and drilled using the rear position. I stopped just as the drill was penetrating the work piece to find that the initial center mark was precisely aligned with the hole I was drilling!