Craig kindly borrowed me his tensioner release tool and the results are on the left:
After discussing with Craig and reading the MH write up on cam timing
http://www.zr1specialist.com/HAT%20W..._camshafts.htm I elected to increase the pin diameter to just under the plug hole size in the tensioner housing. The ring is from key chain I had laying around.
Thanks Craig for helping me out.
Phil