I dont know if i agree with palcing a piece of 3/16 barvstock in the groovs at the back of the cams is the way to go as something could brake, like the camshaft. I suggest that you fabricate a tool instead. Use tow lengths of steel strip 1"-11/2" one peice approximately 23.5" long & the other about 8" long & three bolts with nut & washers one nut & bolt forming the pivot of a forked tool with the remaining nuts & bolts at the tip of the fork. I fabricated on & it worked extremely well. Good luck
Regards