As teenagers, a mate of mine and myself found a B120 dumped in a ditch. The bike was missing the gear lever and the teeth of the gear shaft were worn smooth. We filed the gear shaft square and clamped a pair of mole grips onto the shaft to act as a gear lever! If I remember, the gears are all down. Is that correct?
We rode the bike around while drunk on cider for a couple of days dodging the cozzers! God, your picture brought back some memories!