Two Snake Eye Bolts belwo the one on the right with the X on was one Mark found in the batch when working which was usless due to the holes being odd sizes hence rendering it usless.
What we created was simple enough to do.
All that was required was the drill press and cross slide drill vice and a grinder with a cut off wheel.
Drilling the Snake eyes of the bolt right through the dia hole drilled was 9/64 this gave a tight fit and inserting sheer pins a pressed fit (hammered actually) into place protruding approx 4mm. I had some sheer pins Ken had given me which were ideal for the job.
Below is one pin already fitted and cut off the second ready to be cut.
I have used the spanners on push bikes and other mechanical devices the spanner is often useless as the pins break or as Mark has found work area restricts positioning and use of such.
In searching I found two tools one I would not use in a situation where finished appearance to a job is noticed thats this type.
The second type is more user friendly although torque applied may still shear the pins even on the one we have made.
Of course each bolt size needs its own spanner/socket to suit.