Uh-oh...this information kinda distresses me. I am a long time K810SL, which has become the skinny KMC K1SL, user. And I need another chain. I have broken and rejoined 810SL's a bunch of times - being careful not to push the pin completely out ala JohnDThompson's way. It is a pain thus my also using and reusing a couple of the quick-link style with a separate clip shown in the middle of zandoval's illustration. It has never been a problem but now you got me trying to compare the pins of both old and new versions of my chain and in stock google machine pics - they look the same. Should I be concerned about my other bike wearing a KMC K810SL that has been (mis?)treated this way at least a couple of times?

Ride safe