I kinda thought this was a funny joke until I saw it being
compared to rotating an auto's tires. Then I realized it must be for real.
So, my question is, do you clean/replace the elements in the summer
or the winter? I know the timing must be important, because every winter I
have the auto mechanic replace the summer air in my tires with winter
air, and then the opposite in the summer...
73, Dave Clemons K1VUT :-) :-) :-)
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