For some reason I have not had any "go" lately. But yesterday I visited a Swap Meet and sice I always try to find at least one item to buy I bought some piston rings.
I have had an old Mosquito autocycle engine laying around, for about 30 years, that need two new piston rings.
Unfortunately these rings seems to be made from unobtanium so finally I bougt some that I maybe could modify to fit. The new rings, I was told, are for some Villiers engine.
Above the original
The new rings are cut 90 degrees but that is not a problem. They are also 35.5 mm compared to the original 35.0 mm but that is easily adjusted by filing.