I did not read thru the last couple of replies (but I am going to tomorrow) as I am spent & fixin to hit the hay in about 5 minutes but I did check my shafts today & yeah there is another hole(s) besides the one(s) on the bottom with the groove & it is offset 63 degrees from that hole(s) (to the valve side iirc). EDIT I could cap the (offset) holes in the shaft with JBweld & redrill them inline with the 1/8" drilled hole in the rocker on the valve side (the drill bit photo). clocked for when the spring is closed/relaxed. Should I go ahead? this is a 6K+ circle track 360. thank you for your time. PS should the redrilled in the shaft hole (if you recommend I redrill) be 1/8 also?