For Hewho, and anyone else who has suffered with shoddy,poorly sealing gas taps,I bought a set from Jim Noll at British Bike Connection in Rochester, New York,they are machined from aluminum bar,brass internals and two Viton seals,I tested these at work to 30psi for 15 mins. without leakage,they flow approx. two pints of gas per min.,they do not look stock but they sure do cure the gas tap problems.They are currently around $50 each.Ride safely. James.