Circular handle to operate window

A quick learner from Kennebunkport, Me. says:
August 21, 2020

Installed on Marvin windows ~30 years ago

Mfrd by Miller Mfg Inc, Santa Clara, CA

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Bob from SWISCO responded:
August 25, 2020

See our 39-115 Hand Knob Crank, as well as the 39-107 Cover. If the spline diameter on the operator is 11/32", I think these parts should work for you. 
Truth Hardware Operator Cover
Truth Hardware Operator Cover
39-107
$3.30
Crank Hand Knob, 11/32"
Crank Hand Knob, 11/32"
39-115
$17.24
Watch How To Repair A Casement Window Crank Operator
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