I used a screwdriver to prise my pulley off being careful not to damage it.
The plastic gears all come off easily once the spindle and head are in bits.
The hardest part is getting the keyway keys out afterwards imo.
You will need a puller for the bearings.
It was easier to knock the spindle half out with the head on once pulley, bearing cover etc was removed.
Use a solid plastic hammer or hammer and wood block to do this while head is supported in place so not to damage threads at spindle top.
Once you get started it isn't too bad to do.
These instructions below are pretty damn good.
Pulley:
https://littlemachineshop.com/images...ltDriveKit.pdf
Spindle: (R8 slightly different but similar process)
https://littlemachineshop.com/images...ndle%20Kit.pdf
Make yourself a tool to fit new bearings like this below. Makes life loads easier.
https://littlemachineshop.com/produc...ProductID=1665
I used a piece of tube, made some bushings on the Sieg, M10 threaded rod, M10 washers and nuts.
The second spindle link demonstrates it in use.
I did the full upgrade with mine using all these instructions.
AC bearings.
Pulley set.
R8 spindle conversion.