hey guys I looked around for syringes with the interchangeable heads and the smallest I can find is 5cc. I looked on Getpinz and some other site too, I want something I can change after I draw with (that is how its done right?) and I found Terumo needles 22g x 1.5" which is what I want but 5 cc seems too big to use every time. Help please, thanks!