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  1. S

    Centring in a 4-Jaw Chuck

    Does anyone know an easy method of centring a rectangular bar in a 4-jaw chuck please. After spending about a quarter of an hour, it's still out by more than 5 thou.? Jack
  2. S

    Centrifugal switch ideas please.

    Hi, I am building a contraption, powered by a Hot Air engine, which requires a centrifugal switch. The power output is quite low and the switch will be carrying less than one amp. Does anyone have any ideas for making such a switch please? It will need to be quite small, and operate at a few...