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I have a Sears owners manual which includes parts diagrams but no real description of engine tear down or reassembly, I took lots of pictures but when the two cases are split inevitably parts fly apart and it takes some trial end error to get it properly back together, after several fiddles the gear selector / shift drum works smoothly, a unique shift mechamism that I have not seen before.
I always enjoy Jim's build threads immensely, but reading them creates an odd side effect - I always feel like throwing rocks at my restorations afterwards.
The key switch shown looks like a common lawn and garden equipment switch. Both my Gravely and Lawn-Boy have a switch that looks the same, but they have a spring-loaded "start" position.