The picture above, from "A proud war record", the booklet produced by the Enfield Cycle company after the war shows a technician of the company testing oil motors. Those motors were used in the aiming mechanism of the Bofors 40mm anti-aircraft cannon. Here is the placement of the motor, according to the gun manual. And here is a picture, though I'm not sure that particular unit was Enfield produced, being operated by a US GI.
This is a better view of an Enfield motor,
The Emperor of Motorcycles
7 hours ago