This is a very good idea and not too far off the device we’re working on now (still TOP SECRET) If I can find the right supplier for one component, we should be putting them out by the end of this year.
OK, This is just a quick off-the-top-of-my-head idea. What about a hard felt paddle to do the inside of the serrations? You could use any of the pastes/sprays that you wanted and the felt would conform to the many diffrent types of serrations out there. I think I may just have to try this. Time to order some blank paddles. 🙂