Originally Posted by
noglider
Glad to know of this! I have some trigger shifters on a mountain bike that don't ratchet any more.
Pull the cover and inspect the pawls. I'll bet they're just gummed up with old, hard grease.
I'm near 100% on reviving trigger shifters, and I've done a ton of them. I lost a left one last week when a spring snapped, but other than that - 100%