I also had to make a longer strap. I found a piece of strapping in a dumpster that was the right width and thickness. I cut a piece of steel for the retaining end and took a 10-32 stainless socket head cap screw, but the head off, and beat it with a hammer to make the other end. These parts are shown in the first photo. The second photo shows the original strap. The next two show the ends of the strap after spot welding the pieces on and the next two show the completed chassis after assembling the parts.
The original CRT had a brown paper strip glued around the CRT under the strap. It was also glued to the strap. I guess this was to provide some minimal protection for the CRT and keep it in place. Although not as original, I used cork. It works well and holds the CRT securely. I'll trim it up after I am satisfied with the CRT adjustments.
You can pick up a resistance welder on eBay for almost nothing. They come from China. I can't figure out if they are a knockoff of the ones that Hobart and Miller sell, or if they supply Hobart and Miller. If you do get one off of eBay, don't expect it to work out of the box. It takes some adjustments.
I also wanted to have a fire extinguisher nearby in case a spark caught something on fire. If you have a cat, don't expect the release pin to be in the extinguisher when you pick it up. I can't figure out where Schatzi has hidden it!
John