From Zenith Factory service information.
9-160-03G, 05D, 05E, 08A Module CM 133 / 4-43C 26Kv Board
9-160-06D, 09A Module CM 133 / 4-43F 30Kv Board
11-1981
Manual CM-133 section 4-43.
Unless key is broken off the yoke interlock will not attach without forcing it.
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