Higher top speed on the Myford ML7 - machining countershaft pulleys

Not really needed, but an experiment..
Wanted to find out how much a higher top speed meant, both in turning capacity for a given (in my case 1/4 Hp) motor size and also for the temperature in the countershaft bearings (the left being the most "loaded").
Not yet proven the actual perfomance difference, but from the initial tests done, there seems to be ample power with the smaller pulley (and of course a higher top speed.. even with this small motor). With respect to the temperature, I am also satisfied it will be within limits (actually, the ML7 as delivered with a small pulley and run on 60Hz mains will be in the same rpm range as this "experimental setup" of mine)
PS! There is actually also a 3rd set of speed ranges in addition to the ones mentioned in the video (1232 vs 821 rpm top speeds for the small and large pulleys respectively), namely if you use the outer step on the motor pulley as well as the outer step on the small countershaft pulley. This gives a top speed of just above 1000 rpm.
PS! Normally if I should do a pulley from scratch I would start by aligning it as good I could by eye in the 4-jaw, secured at the outer diameter, face the side flat, flip the piece over so it rest on this flat side, align it nicely again (given the piece is balanced OK so it doesn't vibarte), then start machining down to size, slot and bore. Then lastly flip it around again and machine the amount needed from what would be the rear side. The idea is to have a thick enough piece so you can grab onto the piece inside of the slot for the pulley. Having the piece secured in the outer diameter should also work against vibrations/harmonics that would possibly arise from having the piece mounted say on a boss/on a smaller diameter without backing on the periphery. Leaving eveything there until finished machined should also relieve you of the task of having to "clock it in" etc. I assume one can have a test bar ie. in this case a sample countershaft to try it can run true.
However, I am so lazy that out of 10 times I would just buy the correct pulley.. haha. Purely looking at economy, based on experience my lesson over the years is that if a part for a machine can be bought then it is the cheapest in the end.. at least for me taking into account "mistakes made during manufacturing" making the home-made part more costly. OTOH, they joy and pride, skills obtained etc. probably outweighs the economical factor :)