That glass jar cutting kit from the craft store is a scam waiting to happen
I tried one of those kits last weekend to make a drinking glass out of a spaghetti sauce jar. Followed the instructions exactly, scored the line perfectly, but when I went to snap it the thing shattered in my hands and I got a cut on my thumb. Went back to the store and saw three other people returning the same kit, all with the same complaint. Has anyone found a reliable way to cut glass jars that actually works without breaking?