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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To unsolder chips from a PCB — troublesome. However, it is simpler if we use a medical needle, a sharp tip which is pre-cut with a needle file or abrasive block. O. I, Voronezh
