Steve, you probably don't need to measure them now, as it seems the needles for a Jones Hand are indeed 29x3, and I had ordered the correct needle but in a remarkably big size. When you search 'Schmetz 29x3' you don't find all those Organ needles. The reference I had found stated Schmetz, so that's exactly what I looked for and those are more difficult to source. You find what you look for, I guess. I've used Organ needles, and they were fine. So I will get some Organ needles, as there are several sources on eBay. Jon, thank you for pointing that out!
It's nice, after all this, to know the needles are in current production and readily available, unlike for some of the other antique machines.
I'll PM you for the manual, Steve, thank you so much!
Dianne