We used aquarium tubing.Where did you get your tubing to stretch over the syringes.
Did you buy that U channel, or did you make/bend that into shape? I have never seen aluminum U channel like that at my hardware store.One way I found to fix the movement was to add a U shaped piece of metal in for the wingnut to move along in
We usually use rechargeable 7.2v RC batteries.I was only able to heat about 5cm of Nichrome using a 6-volt lantern battery. What are you guys using for batteries?