Hey Bill,
I meant the tin-plating of the contacts inside the microswitch! My mice accumulate in a heap because after a year the buttons always start to bounce and I never find time to solder microswitches with gold-plated contacts into them (or an ATtiny that takes away the bouncing)
I just meant that because a spindle is grounded, you don’t need an alligator clip or magnet anymore 
Then those motors may not be that satisfying. You would find a spindle nice which has 4 magnetic poles. Compared to the 24,000 RPM constant torque spindles with 2 magnetic poles (=1 pole pair) which have full torque at 6,000 RPM, those with 4 magnetic poles (=2 pole pairs) max out at 12,000 RPM and have full torque at 3,000 RPM or below. If you look at the Torque/RPM diagram at the bottom of this datasheet you will see those with 4 poles can have 2 Nm torque from 1,500 RPM on!
