Hardinge Tool room Compound Ecentric Pin

What breaks the Ecentric pin? I replaced it with a pin from hardinge, and it's broken again a week later
Never mind that we have a number of unqualified monkeys on the machine, but I found the pin tightened in a counter clockwise manner as opposed to how most normal people would tighten it, clockwise
After finding it tightened this way twice, I checked and it was broken again
Any thoughts..