Kurt, you don't have to get a new pulley block, or use a sail maker to unstitch and re-stitch.
Check this pic out.
You drill out the rivet and replace it with a stainless steel nut and bolt. Just a few dollars from Melbourne Bolt Company in Braeside (Boundary Rd)
**If its the metal axle that runs through the pulley wheels that has broken, then that can be replaced easily too, with a male/female bolt. (also in my photo) I think SHQ have them in their spare parts drawer.
Both methods are a cheap and effective repair.
Hope this helps,
- PM me if you have q's
Then if something goes wrong in the future, you can easily disassemble it and fix it yourself.