had the pinch bolt replaced and the 3 grub screws too ,as the old ones had no thread left on them and where falling out of the gun !
Someone had a piece of tape around the gun to hold all the parts together.
I had to re-drill the holes and re-thread them and make some new grub screws too.
There are some places on the cylinder where "air bubbles" in the mold had caused some small holes on the surface that where filled in with brass, and a of these are near the pinch bold area.
This was a normal way of hiding "flaws" in cast iron products that where nickel plated afterwards.
The oldest one has very faint stampings on the T-bar ,the other one has got NO stampings on the T-bar.