Daniel i`m not a 100% sure but i think it was a Wilesco don`t remember the name or the number for the sake of argument let`s call it model x but it was an early version of model x the later version of model x did not have the same functions which i think made the early version rarer that`s how
i understood it the early version of model x was made so that the piston always stopped in the same position and i assume that would be just after TDC. when the press was on making it a self starter. Jan must have described it because at the back of my mind it had something to do with the flywheel what that exactly was i also don`t remember but at the time i thought it was clever. When i try to do a search there has been so many post`s its now a hundred miles down the road. So i think the question should be reversed i.e.who made a stationary engine that the piston always stopped in the same position and how did that work.