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You got it pretty right INGO. I cut many many semi bearings back in the 60-70, My brother use to turn cranks and also with portable crank grinder. A lot of trucks would spin a rod bearing and bro would grind journal in the truck, he would call be back in the shop and I would cut a semi bearing to size. Also ground many semi pistons. Those jobs are about all gone now. It would pretty hard now to find a shop that has any of those machines. Simple things like knulling pistons and installing spacers in worn top ring groove. The younger generation are missing all that fun stuff. Walt