For super thick juices or if you worry about getting drip cap replaced on juice bottle...here's a quick tip 

  Remove the plunger from the syringe and insert empty syringe into the cart...don't worry, it will stay in place 

  Drip LESS than you think you need into the empty syringe and replace plunger 

  The plunger "rides" a bubble of air, forcing the juice into the cart with no force required 

  Use less juice because it's filling the needle at the same time 

  If needed, drip a few drops after spinning juice...which I always do to ensure an even fill of the carto 

  This way no pressure is needed to plunge the juice and no concern about knocking juice bottle and syringe over when trying to fill it