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Slotted version with air channels
Varitube have redesigned their original 510 connector from the bottom up with a completely unique design and are in the words of Perry Genovese at Varitube "A Bullet Proof Connector".
Because of the way they are designed the spring in the varitube v2 makes no contact with the centre pin so isn't any danger of the spring collapsing even at very high currents. Another interesting feature of the v2 is the large flat positive solder point which allows you to solder any gauge of wire both before or after installation.
A great, solidly built alternative to fat daddy 510 connectors
The Varitube v2's T nut should be adjusted before soldering so that the small pin is flush with the bottom of the nut. Too tight or too loose will affect the movement of the centre pin