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Originally Posted by donkehote

I cant fathom the roll pin breaking unless something was done to it. A standard 1/16 roll pin is rated for 430 lbs of shear. How a 23 lb piston broke that is beyond me. Possibly poor quality roll pins, or damage before/during install? Here is data to back up the numbers.
http://www.engineersedge.com/roll_pin.htm

The Andymark usage of the roll pin is not remotely similar to the SAE fully supported static load test. The AM installation has unsupported ends and is subject to repeating dynamic shock loads. We and other teams have broken these pins and AM is not longer using the pins in the current design. A good comparative example is concrete that can stand 5000lbs static load can easily be defeated by a 5 lb 100w drill with the right dynamic load (hammer drill).