Fingerboard Guards

These are a great idea - beats taping off a fingerboard by a mile. In conjunction with StewMac's ceramic polishing wheels (and polishing felts with jeweller's rouge) I can get a really high quality finish after a refret or reprofile. How could StewMac improve them? Well, they are too wide for the highest frets so a couple of thinner ones would be welcome - although trimming them with tin snips only took a few moments. I'd also like a narrower set for mandolins and banjos - the slots need to be narrower as well as the guards themselves.
Jon Press