I can't remember where I saw this, but there's a site... Maybe it's at lybrary.com - they sell blank embossed cardstock for printing on. Anyway, you can create a custom gaff and print it on the site. It's a little on the primitive side, but if you want a fairly simple gaff like a half-and-half or a different index, it'll work fine. It's true that with an Exacto knife and very careful measurements you can do it yourself with cards, but it's very difficult and requires precision.