Mike sent me a link to a TinkerCad design for a straight key. I'm going to print out the parts and see how it goes together. I'll have to or some bearings and a pivot rod. Here's a screen capture of the TinkerCad model:
Looks like key knob on the left in red, along with low contact holder. In grey is the cradle and key arm.
Original link is: https://www.tinkercad.com/things/hjTDqVf2n0u
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