as for the first question in this thread, try a little bit if plumbers epoxy putty and bam no leaking! (i love this stuff thanks highping for your mods tiping me off to this amazing putty)
as for micro pumps, they are imo a complete waste of time, all they would do is add bulk, lower battery life, and cost to mods. and they would need to be adjustable for different viscosity of juice,
very unnecessary when the sucktion from our normal draws on a pv can accomplish the same thing.
thus far afaik only scott has perfected this in his dream pvs (wich he posted a pic of 1 in this thread) though he has not revealed the full inner workings what i can piece together from his hints tossed out here and there is it is bottom feed (via Teflon tube i believe?) self feeding juice delivery via the suction of taking a draw, which is ezly adjustable for different viscosity via an adjustable needle valve. the reservoir is ezly filled by twisting the neck piece to reveal a fill hole. not sure on the reservoir size but from the pic i guess 2-3ml maybe?
anyway going to be honest here, scotts method beats the %#$^ out of anything eles.
scott where you you get you smart pills? mine aren't working