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The WD Motorcycle forum
As a means of saving aluminum for more important projects, lots of bikes had parts made from steel instead, including the M20 tappet cover. Which as Keith stated was just a flat plate. Ron
email (option): ronpier@talk21.com
The 1944 WM20 I just picked up has a flat steel cover. No fancy stacked arms.
email (option): cbhaws@verizon.net