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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If you cut the old metal pipe of large diameter to be sawn along, and then riveted with their convex sides to each other, get both and convenient stand for pens, brushes, pens, and...
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