I am playing around with the old BSA I bought. Getting the tank relined and the little bits that need doing, and of course sitting on it to see how it feels. What I dont get is the gear box. ITs a pre unit box, and it seems that you can select a position that disengages the rear wheel from the the gearbox, and another position that disconnects the engine from the gear box? Is this right or am I just going mad. Its hard to without actually riding the bike. Just wondering what the actual shift pattern is. Its going to be hard to ride shifting gears on the right hand side!