How to make a new cutlass bearing collar

The cutlass bearing is the brass tube with slotted rubber lining at the propeller end of the stern tube. It is what aligns and supports the aft end of the propeller shaft. Eight years ago, when I came up the river, my cutlass bearing was spinning in the stern tube (shaft alley?) instead of the shaft spinning in the bearing BECAUSE the cutlass bearing collar (broken piece on right), which is attached to the end of the deadwood keel, was shot. It was probably shot because the SEAWATER INTAKE (which I did not know existed) was fiberglassed over by a previous owner - so the cutlass bearing was not lubricated enough.
Fortunately, Capt. Clyde has paid attention to my rebuild of hull 113 the whole way, and was quick to point out the existence and necessity of the Seawater intake. He provided the next two diagrams.
His sites (see right margin of this sites main page )and these critical diagrams will not be available forever, so Newporter owners need to visit and copy information as soon as possible. Many are original diagrams of specs when Capt. Clyde was actually building Newporters at Dorchester.
The rest of my photo shows a stainless pipe with "tabs" being welded on to attach it to the keel. Then I will drill and tap a set screw hole. I am contemplating using a nylon set screw to prevent electrolytic action between dissimilar metal, but am not sure it will be strong enough. Use caution not to drill all the way through the brass outer layer of the bearing. The piece on left is an alternative to the pipe with greater thickness for threads, but I would have to use a sidegrinder to cut off the slice I need. (actually, I started this project a long time ago, and I just remembered that the pipe that I was trying to weld stainless tabs on was galvanized, so I will have to cut a slice off the stainless pipe joint on left.)