The machine I was talking about was so bad internally and underneath that all the parts were black with the built up solidified oil.
Caked with it to the point you could not see the joints or seams or screw heads of the parts. How the machine worked is beyond me.
I've had others similar to this, the Minnesota A and B, but no where near as hard to clean.
The few pics I have of this machine do not show just how horribly grungy the outside of this machine was.
I would equate sewing with it to cooking new food on a filthy frying pan.
When I say to clean a machine I'm not saying to strip it down every time, just wipe the excess oil of the bottom and keep the outside and small parts clean.
Joe