Thurstaston

The original Comet motion bracket etch, which doesn't help you I'm afraid. It was just an upgrade to the Comet slidebars and crosshead. The Markits item includes a tube with a representation of the external gland to fit in the cylinder for the piston to run in, which also helps the smooth operation.

I'm enjoying your thread, and being impressed by the speed of progress. I'm working on a Comet chassis for a large prairie in P4. I've used 1mm square rod for the slidebars and a Markits crosshead, which isn't cheap but looks and runs really well. Bryan