... I've rebedded all my stanchions ...
Reminds me.
I've recently refitted some of my stanchions, all were leaking and wobbled, hardly surprising really ...
The job was made much easier with a tool I made for my wife to hold the stub in the right position while I turned the nut below. These are made from Delron rods, M5 High Tensile Bolts, washers to space, and nylon saddle-spacers held in place with a small nitrile O-ring. The hole in the Delron is a tight fit on the bolts, but a wrench is still needed to fully tighten.
In use:
The tools: