Check this out. I spent a couple of weekends designing an adapter for a Canon 40mm lens that I have. The stereography lens has a 52mm thread so you can adapt it to other lenses. Today I opened a simple PayPal store with payhip to see if I can start my way into something interesting. I'll probably end up with just five bucks in my pocket but it would be pretty cool to actually sell a product of my own. So anyway, if you got ideas for other thread sizes I could make it happen. I'm thinking up other options too.