By 1944, the photos and illustrations in the 52-Set Manual and the Truck and Ground Installation Instructions for the 19-Set both have the 300-Watt Chorehorse Canadian as being equipped with the guard assembly.
I would not at all be surprised that as soon as Canadian troops encountered the British Chorehorse in the field, with guard, it proved too popular and the Canadian version was simply dropped. The guard makes picking the Chorehorse up and carrying it, extremely easy, especially if you have just shut it down after a long run. That engine gets hot and stays hot for a while.
David
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