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So I had an idea to have a keyless gas tank for racing this season. The catch was, I didn't want to drop $80 for a good aluminum one or spend $20 on a cheap china one and vapor lock during a race.
I spent 20 minutes and pulled the tumblers out of the lock on my stock cap...for free. Vents properly, holds fuel like it should, and can use just about anything to open it.
So, if anyone else is looking to save some $$$, here you go. If you're patient and can handle small parts, it's really easy too.
Just thought I'd share.