Replacement operators

A home owner from Algona Iowa says:
Can you replace a 9 3/8 operator with an 8 3/8 operator?
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Tom from SWISCO responded:

I see you're looking at our 39-150. Is this the operator you want to use as a replacement? We don't often recommend using a smaller arm, but I suppose it could be possible. We do sell the 39-094, though, which has a 9-3/9" long arm. This sounds like it'd be a better choice.

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