You don't want bird nests and wasps inside it so do not leave it open. I
use small screens in each end. You can make them using a type of screening
called hardware cloth. A strange name for metal screening material. It can
be found with openings of 1/4 or less and is hot dip galvanized. Some of my
screens are 20 years old and are not rusting
Cut discs out of it a couple of inches larger than the boom diameter..
Cut radial slits an inch or so around the OD. Bend the tips in so they will
slide into the boom ID. It will stay in place. You can find the hardware
cloth at Home Depot or similar stores
Dan, N5AR
--
Dan Hearn
N5AR
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