Often people think something is a wheel when it is rather more of a pulley. My experience has taught me to avoid this saying because the real questions are: -

Often people think something is a wheel when it is rather more of a pulley. My experience has taught me to avoid this saying because the real questions are: - Do I gain anything valuable (including knowledge) by doing this myself - do we have the investment to do so (time and money) Too often when this phrase is evoked it's because folks want an engineer to simply wrap and extend when the proper thing to do sounds a little too expensive.