every body will tell you different, or most will anyway (we all have our own opinions). theres nothing set in stone but personaly if your net is 40 meters long so i would be haveing 20 meters top, 20 meters bottom and 1 meter each end for the end pin 42 meters in total. as for the end pins if your new to tradional lon neting you might find agoutis pins a bit small on the loop and as sure as eggs is eggs you will f**k it up in the dark just like everybody else does (mesh goes over the loop). as said above the loop wants to be bigger than the mesh, just make some 5 inch and have done with
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