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   Standard "worm gear" hose clamps work very poorly on small diameter
hose. They don't clamp uniformly, biting and gouging the hose and leave
a lot of their excess ribbon "hanging in the breeze".  The smallest size
available is too large for 3/8" Tygon. I quickly decided they were
unacceptable for clamping the Tygon fuel tubing on my Lancair. With a
little research, I found an excellent clamp for small diameter hose.
It's a Stepless, SS(stainless steel), cushioned , "Ear Clamp", made by
Oetiker, Inc., a leader in the industry. They are about 3/8" wide and
exert a nice, uniform squeeze all-around.  Their part # 15400022 fits
3/8" Tygon tubing. In order to squeeze the clamp properly, you need
their "Pincer", part # 1098. You will likely only need 16 - 20 for
initial construction and maybe a few more each year for tubing
replacements, wing removal, etc. The pincers cost $ 18.00 and the clamps
are 45 cents/ea. They can be ordered directly from Oetiker customer
service at (800) 959-0398 with a $ 50.00 minimum, so that you would
receive about 80 clamps, which will last a few years. When calling their
customer service number, you might first ask to speak with Jack Gleason,
especially if you have other tubing sizes. He is very helpful and happy
to answer all questions.

                                     Bill Rumburg
                                     N403WR  (Sonic Boom)