I carry one and also a small drill that is slip fit for the pin and a small sleeve I made along with a couple repair links. Most of the usage is of the Good Samaritan variety. The drill and sleeve can be used to align the link to replace a pin. Or the sleeve alone works for tightening the side plate on something like the one shown above or one coming loose.





Last summer I came upon a club with one guy down with chain problems and out of about 6 guys no one had any tools or repair links. We fixed his chain but it was ready to come apart several other places so we went around and snugged up all the pins. Told him it was really time for a new chain when he finished the days ride.

Here is what I carry for a tool.