Great little bodge mate

really good explanation. great video thanks!

You need to be very careful here. These couplings are not intended to ever lock solid. Even when working correctly they will allow about 25% slip hot. If you lock it solid, you will overspeed the fan and it will disintegrate. At 5,000 rpm, the rim speed of the fan is in the order of 9,000 m/minute if the coupling is locked.

How to check fan electrics

Cómo le instalo nuevamente el sensor sobre ese disco?
Alguien sabrá?

It's not a bolt, it's a set screw