I just love programming my 30 year old CNC machines, they are so basic, not like modern programming with CAD post processors, I am actually typing each and every G-/ M-/ and other codes. But I can make basically any workpiece that I want. Actually I started more or less similar like Roelof with a design where the RC engine shaft is in a vertical position, like Break In Dutch's commercial version of this system. For only 1 reason it is much easier to build, because there is no need of a relatively complex oil seal system for the shaft from the electric motor going through the sidewall of the oil bath tub. My main doubt with the RC engine in that vertical situation is that the conrod can slide sideways from the bigend end, possibly pushing the piston in the same way sideways with unknown theoretical consequences. Also I feel that the "bottom" side of the piston could break-in differently from the "top" side. Maybe unmeasurable, but for me it just didn’t feel right. I was already halfway with the manufacturing, but at a certain point I took the decision to start again from scratch, back to the drawing board, based on the RC engine being in a horizontal position. By the way, I am a little bit behind with the report / thread, my Easy Break In System is as good as ready, I just need to fabricate the oil bath cover.