Hi - looking for a product recommendation.  I need some cartos for the 510 that don't take a syringe to refill.  I picked up some of the mega cartos that they carry on madvapes, but they all taste like the air that comes out of a fresh can of tennis balls (yuck!).  Asking so I can put together a conversion kit for my nephew, who is an addict in recovery and should definitely NOT have a syringe lying around.
 
Any recommendations would be very helpful. Thanks!
 
Lefty
	
		
			
		
		
	
			
			Any recommendations would be very helpful. Thanks!
Lefty