I too would like to know if there's a way to run the 401 on high voltage, and whether the attys can handle it. All the mods seem to be for the 510 attys, which I'm really starting to dislike.
The m401 was my first e-cig. I didn't truly appreciate how good these designs are for dripping and consistency until I just got my 510.
With the 401, I just drip until the atty is full. If I add too much then it just drips onto the table. Then I pop the cart back on and puff until it's empty again, then repeat. I had no idea why people on these forums complained about flooding attys. It just cant happen with a 401.
The 510 by comparison is a nightmare. You have to hold it upside-down with great care when dripping... one drop too many and you flood it, or get stuff all over the inside of the atty. Then whenever I remove the cart to drip again, there's juice all over the outside of the cart.
If the 401 could just burn through the juice a little quicker, or at higher voltages, I think it would be my ultimate e-cig