Fighting over the scraps ? How big is the market for Commando valve springs ? I have a friend who makes a lot of one-offs for racing bikes - he always registers the designs. I don't know to what end, perhaps he is afraid someone might copy his efforts ? Let's be honest about Commando valve springs ? - for most purposes, the standard ones are adequate. It is only when you chase horsepower by moving the power-band upwards, that you have problems. And there are more problems in that besides getting the valve gear to keep up.