jd, first of all I will say again that I made the center pin longer to fit all 901 atomizers. There are people that asking me for the bigger pins of the new GGTB batch to fit some clearatomizers that cant fit in any other cig. But your issue is not this.
Ok, to the issue now. The AFS pin has a cut as you said. Same cut exists on the GGTB connector. Those 2 pins cant meet each other in the way you said so to unscrew each other. Thats impossible. If you think a little more you will understand it
I also saw that you used pliers to tight the pin on the plastic. Be sure that you will damage the plastic soon.
You had a short so spring melted. Maybe you thought that if you screw harder you will make the contact. But spring was very short to make the contact. You kept trying until you unscrewed the whole connector. So your problem with GGTB is that you need to screw again the connector that you totally unscrew. The simple steps are:
1. You unscrew the pin
2. You unscrew the plastic
3. You screw as hard as you can the connector on the cap
4. You put plastic again
5. You put pin again
You are right about spare springs but they do exist as spares to my sellers sites
ps...... All things on every GG are easy until you can understand the problem buddy. Of course maybe this connector was not screwed as hard as it had to be screwed from me, so maybe its my mistake. But you can do it again like new by your own. Thats the beauty of GG
devices
ps2..... If you dont like the long pin you can unscrew the pin, put a 3/1,5 o-ring via pin, screw the pin again.