I remember seeing some instructions for making one of those braided crosses in some book or maybe it was a copy of Knotting Matters. I’m not talking about the carrick bend patterns this was a solid braid. If anyone can point me in the right direction I would appreciate it.
The cross tools posted at KHWW are fine for #30 line, and maybe even a little heavier line. If you want to make a cross with much larger line than that, you might want to scale up the tool. For the cross we made in the photo that used 7/8" manilla, I used 4" and 3" PVC to make the tool. I also have a tool made with 2" and 1 1/2" PVC that works OK with 1/4" cotton. I am more than happy to help with scaling up any of my grids for large size applications.