I bought a new set of piston rings that according to the S.N. the rings I got are correct, they fit the piston and groove, but the 2nd and 3rd piston grooves have a lug or pin imbeded to keep the rings from turning.
Picture of the Workwell engine.
The engine is all cast iron except the connecting rod which is bronze. The main bearings are bronze.
The sketch shows how we set up the rig. The parts should be available at most any surplus store.
The adjusting knob of carburetor was broken off but it runs without that adjustment.
The hole in the back of the water hopper cowling over the connecting rods