I've read you can make your own polo-specific cranks. All you need is two con-rods from a 1941 Rolls Royce aero engine, a pair of output bearings from the transfer box of a 1957 Series I Land-Rover, a brass candlestick, a sparkplug from a Bedford MK army truck, a penknife or broken hacksaw blade, a pearl necklace (must be the type where all the pearls are the same size), some string, an empty custard tin, some Gin (or Vodka) and a bar of coal-tar soap. Easy. Never got round to doing it myself, 'cos I haven't got a penknife!
I've read you can make your own polo-specific cranks. All you need is two con-rods from a 1941 Rolls Royce aero engine, a pair of output bearings from the transfer box of a 1957 Series I Land-Rover, a brass candlestick, a sparkplug from a Bedford MK army truck, a penknife or broken hacksaw blade, a pearl necklace (must be the type where all the pearls are the same size), some string, an empty custard tin, some Gin (or Vodka) and a bar of coal-tar soap. Easy. Never got round to doing it myself, 'cos I haven't got a penknife!