Velux skylight Handle

A quick learner from Vermont says:
I have a velux skylight (not certain which model) which is within reach to operate manually. There's a hook on it now, which is difficult to operate by hand, and while I could buy a pole, the bottom of the skylight is about chest high, and using a pole would be awkward and unnecessary. The hook covers a 13mm hex nut and stays in place with a set screw. I'm looking for a handle to fit over the 13mm hex. I have a stubby socket wrench w/ 13mm socket doing the job now (easier than turning the hook with fingers), but would like a proper handle. Is the "ZZZ 212: crank handle" what I need? No specs provided anywhere about how the ZZZ 212 or ZZZ 101 attach.
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Paul from SWISCO responded:
I'm not familiar with those part numbers you provided, but our 39-555 is meant to work on Velux skylight operators. Could this be what you have?
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