LOL! I think home machinists love the machining part of doing things. I have some really nice aluminum fishing reel eddy current rings (machined by dad-in-law) which I epoxy to the non-drive side of the spool on conventional casting reels for salt water. Coupled with 4 small samarium-cobalt magnets epoxied inside the cover plate and voila, super-anti-backlash system for big water casting. Saves skin off the thumbs and, like indexed shifting on bikes, it allows the dilettantes of conventional casting to fish like the pros!

But I'm sure if I could find a supplier of the presta/schrader valve seat screw at a cost of $1 each in quantities over 1000, I could sell these at 100% margin to cyclists at $2 each and turn a small profit too. I wonder what the cost of coloured anodizing might add.... hmmm