So I went through this whole thread, and all the options are interesting. I tried 3d printing a 45 degree connector to link the stock handle, but the littlest force would snap it in half. I tried to see if PVC would work. 3/4 PVC outside diameter is VERY close, but a bit too tight (1.05"), and then you still have to figure out a coupler between the PVC pipe and the metal tube.
So after taking some measurements of everything, I discovered that the inside diameter of the chrome tube is very close to the outside diameter of the bottom lift handle socket, like within .1mm. Now that might not sound like a lot, but even after grinding down the powder coating with a wire wheel it was still too thick...
So out comes the angle grinder. If you're careful and grind in straight lines, you can maintain the round shape fairly well. Few tips
1. absolutely wear goggles
2. try to wedge a piece of wood to prop the tube away from the bottom to give you maximum space (so you don't end up grinding the cart base or the cable)
3. Keep checking fit, make sure you're staying consistent up the tube
After it seems to fit good, you can use the wire wheel to smooth things out. You may want to also spray the surface with oil so it doesn't end up rusting (if you grind enough you may be able to repaint it)
Once you fit it over, line up the hole of the tube with the hole in the lift socket. Time to get the drill out so you can make a hole through the pipe so you can put that bolt through.
After chopping through the middle of the handle with a tubing cutter ($6 at harbor freight), I 3d printed a plastic handle so I don't cut my hand on the sharp edge. You can obviously find stock handles that fit over a 25mm pipe, but I'm cheap (and have a printer)20200623_174701 (resized).jpg20200623_174705 (resized).jpg20200623_185420 (resized).jpg20200623_185431 (resized).jpg