Originally Posted by
Lazyass
One time only? I assume you completely removed the pin from the link? You should push it out just far enough to separate the links. Then push it back in to reassemble the chain.
NOT on a newer Shimano 8-, 9-, 10-, or 11-speed chain. If you break the chain to remove it from the bike, you should use a new replacement pin. Also you shouldn't break the chain at the same pin; rather, select a pin that's never been removed before and replace it with a new pin. I've seen a couple of Shimano chains break due to people reusing the old pin. The worse was a guy out of the saddle climbing a steep hill. He went from vertical to horizontal in about a half second - fortunately into a ditch instead of into a road with traffic.
I use KMC links with Shimano chains on my 9- and 10-speed bikes instead of the pins so that I can remove the chain to clean and lube it.