Re: Edmund Parabolic Reflectors

[Walter Knapp <>]

From: Gregory Kunkel <>

>
> Mike
>   The 24" parabola has a 1.5" hole. You could reduce the size of the
> hole to 1.3", the diameter of 1" pipe threads by using a flexible
> grommet available from a supplier such as Digikey. A more economical
> grommet that I have used is a piece of 3/8" OD  X 1/4" ID vinyl
> tubing split lengthwise. It works and replaces the rubber washers
> shown in my diagram.

Back in the plumbing section of a well equipped hardware store you can
also find all sorts of washers and seals, some of which will work well
for such a small size difference. Look particularly in the stuff for
sink drains and such like.

Walt




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