Arm length on Hope operator

A quick learner from Oakland CA says:
We have old Hope operators in a 1950's house. The arm measurement is 9.5" rather than 9", measured as you show in the diagram. Will yours work OK on our windows (i.e., just shorter swing-out)? The crank on ours is not centered on the base, but offset a bit. Is that also OK? The 4-1/8" screw mount mounting measurement is what I have.
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Dave Sr. from SWISCO responded:
To be honest, the 39-353 and the 39-354 are the only operators currently made to work in place of the older Hope operators. I believe with the shorter arm, it might not open up as far as the original, but that would be it. All and all it should work as a good substitute.
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