I would like to see a photo of your belt where you joined it

That is truly a 'golden girl!' She's the right age and right color. How cool!

Here ya go!
[ATTACH=CONFIG]312339[/ATTACH]

Now THAT'S a 'golden girl'!

Just how did you join it?

Before sewing the two ends together, I took a small piece of packing tape to hold the ends in place. The tubing bends and doesn't hold its shape when sewing. So, to reinforce the material before sewing (and make it easier to sew), I wrapped a small piece of packing tape around the section I would be sewing. Then I took the dental floss, doubled it and made a quilting knot at end, went through the tubing a couple of times, and ended with a double half hitch knot. Some of the edges of the packing tape are showing the signs of wear from where the tape hit the machine, (which was before I filed down the machine areas where the belt hits).
Hope that makes sense.:)

Thanks, I use dental floss a lot to sew things like that

I guess my worry would be the tape gooing up the wheel.

Thanks for showing that. It's always the little details I wonder about. I'm not familiar with aquarium tubing. Is it a stiffer plastic or more of a squishy, floppy plastic? Does it have much stretch to it?

The tube I found is too thick to go through the channels in the Singer 401A. Some spinning wheel belt might do the trick. Someone here is experimenting with it. I saw that you can fuse clothes line but I think it might be just as thick as the aquarium tube - at least now I have some idea how to hold it together. I have wondered if an extension cord would do - it is the right size but holding it together might be a trick.