Rear Derailleur Shifting Issues... Trying a new missing link...

Bought some new missing links.

This one is for 10 speed Campagnolo chains.

It's slightly more narrow than the Shimano 10 speed version...

This one is for 10 speed Shimano chains.

Made in Taiwan.

Shimano on the left & Campagnolo on the right.

It's difficult to see but the Campagnolo version is a fraction of a mm narrower than the Shimano version...

I tried to install the Campagnolo version on my bike with the Shimano chain & it won't fit!  That fraction of a mm is just enough to keep it from going on.

So, I installed the new Shimano version missing link on the bike.

Will test ride it tomorrow to see if it makes a difference...