Wrap one or two layers of masking tape around the ball bearing. This is for heat isolation and is also needed to tight fit the bearing into the shell.
Put the ball bearing into to holder and put the bearing holder on the top of the soldering station base. After that, put the screw through the holes.
Put the washer and nut on the other side and tight it with a wrench and a screwdriver. The angle between the holder and the station is fixed.
Moistening the soldering sponge and put it in the shell.