I got around 28 drops in a carto (wasn't even a blank, but one I rinsed out) using this method:
http://www.e-cigarette-forum.com/forum/vapor4life/47584-my-refilling-trick.html
Also, I think it really depends on the bottle you use- some of mine put out smaller drops than others
I would choose the later over the earlier Birdy. IMO but could you tell me the weight? before and after fill... in grams would be great. because you can do all the spinning you want you can still put in only so much in a carto with out overfilling
the reason I say weight in grams because 1g =1ml as a general rule of thumb.
maybe the weight of carto pre and post spinning to see if you are actually loosing drops
Note: this might be a time consuming thing to do... or you may not have a gram scale.... so this is an open question....
I am curious to hear the out come...
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