Originally Posted by fietsbob

Modern bushing-less flush rivet head derailleur chains are never lengthened,
only shortened and joined with a quick link.

to effect repairs you bring a section of the same chain and more quick links...

So for pressing out the rivet pin, the chain tool can be simple , though it needs to be reliable..


gave a trusty, but not the lightest one, to a friend , he found a lighter, more aluminum one , brought it instead ..

and somewhere in the southern Argentine Andes foothills he had to find a nail and use a rock ,

when the lighter chain tool broke.......