Yes..the 9.9 reading on the vamo is an indication that there is no atty attached.. therefore tge protank is not making a good connection with the 510 pin on the vamo.
This may be down to two factors:
1. The vamo 510 got pushed in a bit..in which case you can take a pin and raise it up a tiny fraction..not too much or you might cut the wires
2. The protank head 510 pin is pushed in ..solution is the same..wiggle it out a bit being careful not to pull it all the way out or you will misplace your coil.
Hope this helps
This may be down to two factors:
1. The vamo 510 got pushed in a bit..in which case you can take a pin and raise it up a tiny fraction..not too much or you might cut the wires
2. The protank head 510 pin is pushed in ..solution is the same..wiggle it out a bit being careful not to pull it all the way out or you will misplace your coil.
Hope this helps