yup, that's about right.
I use "oak tanned" leather,,the stuff is very rigid,very tough. It's actually scraps from a "Saddle" maker,,,,
After the wet clamped form fit for each blade, I prefer a stitched welting on the cutting edge vrs. rivets. I use a 4 prong punch I got from Tandy to get even spacing for my stitch,,,,that's what I do,, best wishes all