I have an elderly Axminster with similar pulleys, these are the variable speed pulleys with a lever to control the speed change.
i have replaced both sets of pulleys and i needed nothing more than a pair of expanding circlip pliers and a some allen keys. It is not rocket science, just take it apart and set the pieces out systematically and you will see how to replace them.
Why do you need to dimantle them? if it is to clean and lubricate then use a spray on dry lube, from Axminster among others, or if you are changing parts,good luck with finding replacements!
Ron