I have a blue floor corker with brass jaw that I purchased at a garage sale.
When it works, it works great but 25% of the time it leaves 1/2" of the cork
protruding on top.
The arm is very stiff so I cleaned it and oiled the moving parts (except the
jaw). It seems the slightly bent rod sometimes misses the opening of the
jaw and hits the side. I think this is why every once in a while I get left
with a protruding cork.
Has anyone run into this before? Is there a prescribed maintenance for
these corkers? What on earth is the chain in the back that connects the
bottle platform to the arm and how do you adjust it?

thanks
Joe