Originally Posted by
Wilfred Laurier
That looks like a non-peened-pin chain link spliced in to a peened-pin chain. For a 6 speed, I would source and install a new non-peened-pin chain.
However, if the current chain is very worn, the cogs will likely be worn to match and the chain might skip violently under load.
Thanks! I flexed it a lot, and cleaned dry lubed that one link repeatedly. It is still just a little bit stiff, but is working fine with no skipping now.