Hello, I don't know if I am posting this in the correct place. But can anyone tell me the correct size tap and due to fix my 510 threads and possibly give me a link to somewhere to buy them? Thank you for any help you can give me.
510 connector is M7 x .5. Amazon is probably where you want to go. Mscdirect often has good prices on taps but it's an off size so you have to hunt for deals.
A tap will not replace worn away metal, if it's stripped, it's stripped! A possible quick fix, cut a small strip of business card stock and put it in the 510 and see if your tank will grab and screw in!