The cylinder turns 360 degrees (obviously) but some machines have double impression cylinders which makes it more fun. And to make it more complicated the alignment scale goes to 2 decimal places of a degree. So it is more likely that he was a few degrees out rather than a whole cog. For example when some of the plate clamp systems fail you must rotate the machine to exactly the right position before you can release the pneumatic cam. That sucks.
Reminds me of the time I rebuilt an engine and the when I put the timing chain back on (yes chain, I'm an old fart too) the manual said "align the nickel plated link with the TDC mark on the toothed cam gear". Problem was that someone had replaced this chain before with a non-genuine part and there was no nickel plated link! Being a young fella with hardly any tools I worked it all out mathematically with a spirit level and a protractor, and got it exactly one cog wrong...