regulator

hey im doing the mag lite does anyone know what i can build or a tutorial so i can build a regulator

If you want a regulator, don't do the mag lite mod. Simply put you won't fit any sort of regulator in there.

As for a small regulator for another host, either build a LM317 circuit or buy my one. Link in my sig.

Actually you can with some changes. Using one AA Li-ion battery, a dummy cell, an AMC7135 regulator and a 33 ohm resistor it can be done. You would probably need a tail cap switch as well. The 33ohm resistor would be used with SenKat's diode.