Right now, I'm using the blue foam (size U), wool on either side (of the foam) plus a straw down one side of the cart. I can now use a cart on the Prodigy! I've read everywhere that you have to drip using a Prodigy but with this mod you can use a cart!

If you have a mod, this is the way to go.

Works on Prodigy, Protege and Chuck!

It sounds like a lot of work, but once you get the hang of putting it all together (I get each item together first for several carts) it only takes a few minutes to stuff the carts.

You have to cut the foam a bit smaller, no need for the "v" at the bottom of the foam. The wool tends to stop the leakage, unless you overfill the cart.