Truth part # 41011 and 41012

A quick learner from Charlotte NC says:
I need these parts. The crank handles I have are still good. Can you point me in the right direction? The internal gears in the ones I have are stripped.
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Bob from SWISCO responded:

Thanks for posting. It appears you have either the 39-253LB and 39-253RB , or the 39-438B and 39-439B operators. The difference between these two sets is explained in the video below--please watch it. In either case though you can use the 39-375 and 39-376 or the 39-451 and 39-452 for new covers and handles, depending on the style you prefer.

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