master cylindeer replacement

[olguy]

Hi, Does anyone know of an easy conversion method to convert the master cylinder in my 1941 sedan from a single piston to a dual system? I know the original is O.K., but for safety's sake, I would like to have a dual system. It is a stock 3-speed, so there is a clutch assembly to consider. I just wondered if anyone found an easy way to convert....Brakes are stock drums all around and I don't want to change much.
Thanks for any responses,
Tony