What spline do I need?

A quick learner says:
Will you please tell me the correct way to identify the correct size spline I need? The channel the spline fits into on my screens is, .125. Do I need to order the .120 spline? Any help in this matter would be greatly appreciated.
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Paul from SWISCO responded:
Thanks for posting. I believe that our 59-120 would be the closest match that we can provide. If you go to the next larger size, it may be too big.
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