The oil pump retaining set screw has a hex head & the end is tapered.
Size... 7/16 - 14 x 1 3/8 overall.
The length & having the correct size tapered end of the set screw are very important.
The tapered end is there for a reason.
The taper is like an adjustment, only goes in the oil pump hole so far.
It correctly locks the oil pump body in place so it doesn't move.
The lock nut only locks the set screw.
Wolfgang, you should not "Jerry rig" this part.
