Hurd replacement mechanism

A home owner from USA says:

perhaps you can help me. I need to replace the crank mechanism on two (2) Hurd windows (1990 vintage). Both of these windows open on the left-hand side (or did until the crank mechanisms failed).

User submitted photos of a window operator.
Profile picture of Paul
Paul from SWISCO responded:
Hello! Our 39-387 operator might be able to work for you. Carefully look it over and tell me what you think.
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