(ET) field weakening potentiometer with a Curtis 1204

[Tim Maxwell <timmaxwell chartertn net>]

I am considering putting a Curtis 1204 (sitting on the shelf collecting 
dust) in an E15 (most of card 1 has been bypassed by the PO due to 
failures).

I vaguely remember reading somewhere about a user putting a 
potentiometer in the field to provide a variable "turbo mode."
The resistors on card 3 are 20 ohm 10%, but what wattage are they?
IE what watt rating would the potentiometer need?

Tim M