If anyone has an early sight glass assembly they would be willing to sale let me know.
Jack
Doesn't Jensen still offer those. Awhile back I bought some through Dorita, even a long one for some projects.
These are quite a bit different from the 50's blocks, there isn't a hollow screw on these (IE banjo screw) ,this screw would be solid with a side port around the screw to allow steam through. A special type block.