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If it was big enough to stamp, BSA stamped it! Wheel bearing adjuster from the 1929 Model S Sloper.

Smooth low-speed running requires a clean carb. Rather than brushes and bits of wire, an ultra-sonic tank will remove deposits – from brass or alloy carburettor parts – without causing damage.

Every link of the primary chain is stamped BSA – could this really be the original from 1929?

Although there is no evidence of the Sloper ever having been painted in military olive drab, records indicate that it played its part in the war effort. The full story is here.

BSA promoted the mechanical silence of the Sloper in their sales pitch – perfect for creeping up on unsuspecting criminals!

Found in the bottom of the gearbox – one broken tooth! Missing from the one o’clock position in the picture.

And yes – I do have the engine and gearbox! SM7741, dusty but not rusty; even the control cables are original 1929 items.

A reassuring image of Britain between the wars – no Wall Street Crash or Great Depression clouded the skies of BSA’s advertising in the late ’20s and early 30s.