I'll be putting some of the wax on order but I had been moving the needle as I worked on this one but the breaks occurred as I was trying to synch the visor closer to the helmet. I almost wonder if the shell has shrunk to much and now the visor simply won't match. There is a considerable gap.It protects the thread by giving it a wax coating and lubricates it so it passes through the stitch holes more easily. There is a lot of wear and stress on these “natural “ cotton and linen threads as you stitch. When stitching a regular visor you have to keep waxing and moving the needle along the thread so that the eye does not cut through it. If you don’t move your needle you will see the thread begin to fray and eventually break.
The visor trim is still attached to the helmet and fits just fine, I'll take some photos shortly here and post themI believe you can buy bees wax at Walmart, where they sell thread and yarn, if memory serves. A shrunken shell could be the problem though . It is never simple dealing with these old pieces of History. You could use the metal visor trim to check for shrinkage.