from the looks of the pictures that stuffer has metal gears... mine has plastic gears (which are white)... and they are broke at the moment.. need to order new ones... If yours are plastic just make sure you wet your mixture pretty good when doing snack sticks... I'm thinking the plastic tubes aren't small enough to do snack sticks that's why others order the smaller stainless tube... also you might want to order long, small, bottle brushes for cleaning the smaller tubes... Enjoy your new stuffer and we'll guide you along the way ...
This looks like it should cover all the tubes and good for other things as well...
http://www.harborfreight.com/9-piece-tube-pipe-nylon-brush-set-90631.html