After a lot of changes to the geometry to the fuel senders, I set up the left one to a point that I considered satisfactory. I then inverted the tank and added some fuel to do a leak test. So far so good.
Installed the cork strips.
Installed the sender in the R/H tank
At the time of taking this photo, the sender had been immersed for about 5 hours and no leaks
Visual fuel check with a graduated probe will be part of my preflight.