PSA has gone through about 10 different flip designs, I am sure you can find them here or on the web. Won't help too much on some with a wide span but can at least provide some baseline information about range.
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Net 54-- the discussion board where people resent discussions. 
My avatar is a sketch by my son who is an art school graduate. Some of his sketches and paintings are at
https://www.jamesspaethartwork.com/
Last edited by Peter_Spaeth; 08-10-2021 at 01:39 PM.
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