Originally Posted by
Wordbiker
Pretty much all modern chains are not meant to be broken and pressed together again.
Shimano has their proprietary pins, other manufacturers use various master links, but all of them are an attempt to keep the peened pins on the chain intact. Break the chain once to size it, apply the master link or pin and that's it. If the chain breaks, needs to be resized or wears out, you buy a new one and start over...or add another master link or pin.
That being said... I've removed and reassembled pins from Shimano 7/8/9-speed, KMC 7/8-speed, and SRAM 7/8/9-speed chains. All without ill effects. I like the Master Links on KMC and SRAM chains a lot.
I was too cheap to buy replacement pins/master links, and have not had any trouble ever replacing the original links as long as I do it fairly carefully. Not sure how representative my experience is...