need replacement operator, identification

A quick learner from Englewood, FL says:
Hi - I assume I need to replace this operator. It will open the window, but when closing, the crank stem screws out of the housing. Note the offset holes at the bottom, the bent link, and circke clip fasteners. House was built in 1988 - I assume these are original. Can you identify? Thanks!
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Emily from SWISCO responded:

Hi there!

You assumed correctly! It sounds like your worm gear is stripped. That part can't be repaired or replaced which means you'll need a new operator. Start by taking a look at our 39-258 and 39-259 operators. The style of link arm and offset hole pattern on the bottom tab is similar to yours but you'll need to compare our dimensions to your old hardware to see if this matches up. 

How to Replace an Awning Window Operator [1080p]
How to Replace an Awning Window Operator [1080p]
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