wow i never thought of the mouthpiece..
I was thinking more along the lines of maybe those metal tube pieces that the small metal pipes are made of. you know -- the ones that unscrew to like 10 pieces so you can clean them. I was thinking maybe one of these pot heads would know where to buy the individual pieces that those pipes are made of.
This will be a bulk project, and it would look pretty silly to headshops if I went in with a bong for sale to them and I had to buy sliders for each one before they would buy the bongs from me ??!!
Thank you for your suggestions. They are giving me many ideas.
When the product is released I'll be sure to let you know