Very Good!!! Yodabob
The engine sprockets are scrap from the Chinese...I had planned on making several hundred of these, but if you are set to do it in volume...
I made the same type of chain tensioner for the Schwinn Jaguar...It worked perfect!
It is not necessary to utilize the 9 bolts when doing a clamshell. Next time try using (3) 3/8" bolts. It will be plenty strong and save on the machining time. I did a 9 pin for the Spoiler belt drive set-up out of necessity.