A contractor from Pasadena MD says:
March 31, 2010
how do you measure the spindle. diagnal or across? does the 40-150 generally fit a larson storm door 4 post?
Dave from SWISCO responded:
April 21, 2010
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.