Glue this cam to the driver axle and use the Grizzly Mountain Engineering Wiper Mount Kit to complete the circuit.
Select the number of chuffs per revolution of your axle and your driver axle outer diameter. About 90% of the HO locos have a 3 mm axle.
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COVID-19 INFO: Arizona has issued an ordinance for us to shelter in place through the end of April. Orders will be accepted and processed, hopefully, with no change in service. Thank you for your patience! Dismiss