Feel great! now i can match my 402 battery to 510 cartomizer. In the end, i bought also another 2 pcs filler less cartomizer from him., another cartomizer will match my 510 battery very nicely. See below picture for my new 510 and 402 setup with adapter and filler less cartomizer. Vapor produce so great! Unbelieveable! the 'vaping action' for this new setup already posted at my Videos section. To improve the inhale airflow, the drip tip being replaced the cartomizer soft cap., this drip tip will make my job to refill the liquid become easy also.