To calculate how many coils to cut for the trommel barrel:
Devide the barrel length by the spacing you want between
the coils plus the coil width ( 30/2.375" )= 12.6 number of coils.
12.6 x .375 = 4.7 " of tube min. needed. If you have enough
tube, cut a few extra,, it can make inserting them into the barrel
less work. After you have them in place cut off the extra.
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