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My memory is trying to tell me that the mod involved 2 each 15 ohm - 20 watt resisters in parallel and wired such that by replacing the SPST rocker switch with a SPDT rocker switch you could have a 2-speed fan. One side of the SPDT goes directly to the fan motor. The other side goes through the parallel resisters to the motor and gives you a reduced speed (and air flow) and noise.
The problem is finding the 20 watt resisters. Radio Shack normally carries 1/2 and 1 watt resisters but not the heavy duty stuff.
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