Old non gold low ohm version spring.. prob be fine if your vaping around 1ohm.. not sure how low you can vape on the old spring.

live and learn! Haha only way you learn is by doing. Hopefully you got a few reos right?
Yes! You all taught me to have back ups for my back ups!
I've dropped a spring or 2 as well. Haha
I’m in good company!
So with the 510 pin tight all the way in what reading are you getting with the dmm set on DC?
I forgot to mention that I did check the dmm trick on DC with the P-67 and got a silly number...I think .08 or something like that (should have written it down). Certainly not the 4.19that I got from my Grand and I didn’t collapse the spring hahaha. (Still wondering how I accomplished that).
What atty are you using? Is the center pin on that atty pushed in at all? Flat to the threads or sticking out?
I’m using an O-16 and it’s working fine on my Grand now. I tried the O-16 that was on my Grand on the P-67 but not firing on it. The center pin is sticking out slightly below the threads.(I’m pretty content with my O-16’s and don’t take them off except to re-build every couple months.
Have you tried firing it with a different atty with the 510 screw on the p67 high?
No
Remember the 510 screw is reverse threaded which ya prob figured out by now but just encase.. right (clockwize)will rise the screw and left (counter clockwise) with lower it.