The Slim Twin was a great little razor. I liked it because of the button that pushed the gunk out of the second blade. I had several handles that were give aways to college kids. I used it until I could no longer find replacement carts. I no longer have the handles. I'm not sure if one could take a cart off a disposable and use it on the nondisposable handle. I've only seen one handle on ebay. I might buy some disposable Slim Twins the next time I'm not checking my bags.
--- Ty ---
Veni, Vidi, Ego Tondeo!