I have been asked to show the assembly of my cell, so here it is. Sorry if anything is unclear. I tried to show the basic steps without showing any machining, etc. The pipes are 304 SS, but 316 works well also. Part 3 will be uploaded after the cell is sealed and ready to run.
I insulate the pipes from the Positive lead/screw by first coating the screw with 2 coats of liquid electrical tape. When that is dry, I put electrical shrink wrap tubing on the screw, making sure to leave the end thread exposed for connecting it to the center tube. The holes in the pipes that the positive lead screw passes through are twice the size of the screw, leaving plenty of room for the screw and insulation to fit through……if your holes are aligned.