Crank out handle knobs

A home owner from VA says:
I have twelve crank out wooden windows. Over the last 15 years, I have seemed to lost a part on the handle knobs because they just slide off and on. This presents a danger with toddlers and babies in the home. Do I have to replace the whole handle or is there a way to find and replace what's missing?
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Bob from SWISCO responded:

Thanks for writing in. If part of the crank handle broke off, the entire handle will need to be replaced. We can help you find the right replacement, we'll just need to see a photo of the handle as well as the diameter of the spline it attaches to. From there, we'll narrow down what you need.

How to install a wood casement window crank
How to install a wood casement window crank
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