spindle measurement

A contractor from Pasadena MD says:
how do you measure the spindle. diagnal or across? does the 40-150 generally fit a larson storm door 4 post?
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Dave Sr. from SWISCO responded:
You measure the spindle across. The 40-150 handle works with a 1/8" or a 3/8" spindle. This handle does work with some Larsen locks, but not all of them. Please check closely to see if it will match up to yours.
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