I usually draw a little air into the syringe before I suck up any liquid because I can see the bottom of that meniscus better. Plus, I figure pushing the air out behind the liquid cleans out the needle too.
That's the same wrap I have on my Pthingy and I love it. Haven't tried to take the JWrap off, but I'd think the problem would be not to stretch it. Maybe if you put it in the freezer for a few minutes? I think I've heard of people using contact paper to make a wrap - somebody on this thread?
The only problem with drawing a little air in before the juice is it gets pressurized when you.push in the plunger and make the syringe drool on the counter when I set it down with anything left in it
Sent from my Galaxy Note 2 Android phone on a keyboard that waaayyy too small (or my thumbs are waaayyy too big).