Precision machined from brass stock, flywheels are drilled and reamed for slip fit on drive shaft. Each pack includes two flywheels, with Athearn couplings installed and complete instructions. Dimensions shown are outside diameter, length and shaft size.
 
Flat can motor fits Athearn S12, SW1500 and most narrow hood units with short wheel base, AHM Alco 1000. Can also be used for steam locomotive repowering.