Bike pedals used to put a metal screw cap to protect the bearings from contamination. Now, instead, use the plastic plugs, which are often lost. Rescue plastic or nylon tubes from medical bubbles. Such substitutes being kept quite steady.
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I'm a longtime subscriber of your magazine, use a lot of printed in it. I especially liked the article "Fire... of water", published in "M-K" № 7, 1980. The description made the cell,...
