Yes, my mistake for not being specific. It's the 510 connector. It seems the spring has worn out so I'd like to replace the spring and pin. The collar is unique in that it's notched on two sides. Are pins a standard size? I reached out to Smoant and they said to send them pics and they'll see what they can do. It'll probably be much faster to buy it from the USA.
That sounds like a good plan to me. Thanks.That I'm not sure of. I'd be tempted to see if you can pull the 510 out of the mod, measure it, order the appropriate size (16mm, 22mm, etc). You can pull the new one apart and compare the pin sizes. If they are different, just notch the new one to fit with a dremel and solder away.