I think it was a documentary about how straight razors made or documentary about Dovo company straight razor department, I am not sure which one; towards the end of the process of making a straight razor, there was large round sharpening stone which looked like a coticule, turning like a record and they were laying the razor flat on the stone for honing/sharpening. So if you built something like a record player(so to speak) which could hold different grades of honing stones(must be disc shaped obviously) can be put on this turn table and also a leathper disc shaped strop, also this turntable got to have forward and reverse gear or an AC motor perhaps.
Good Luck