Alternator of "how-to"´s look like mine used to be... Black and full of dirt and rust...
I opened that pulley... my camera died...
EDIT: pics
Started grinding edge
First I drilled a hole in the middle of pulleys bearing cap. Then I drilled a hole to a block of wood. And hammered bearing and its bolt out thru that hole.
Here are all ready to come together. Pulley, bolt, 6203 bearing and plug to cover pulleys hole.
Ready to use...
Plug looks stupid, but it was all I had.