SWISCO - The Replacement Hardware Authority

Where is the size determined

A home owner from Ohio says:
I have a Pella sliding screen that the trolley is broken on. Where is the measurement taken to determine which size to purchase? This door had three sections the slider is in the middle. Do I measure the siding door portion or the overall length of the screen slider? Also, does this include the wood trim that encases this mechanism?
Profile picture of Tom
Tom from SWISCO responded:
We determine the length of this trolley by measuring from the center of each wheel. We actually have a picture of how we measure on the 80-053 store page, which I will post here.
Detail of 80-053
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