Photos taken from a couple of strip downs.
Cap rotor arm shield off and then remove top circlip, need small circlip pliers 1mm pin/hole
get it in a vice with a rag or soft jaws to protect and using two flat blade screw drivers lever the vane off, the vane is made from thin sheet on a central boss so you want the screwdrivers on the central boss, it’s not easy as it’s chamfered. Plusgas is good if it’s stuck on, you may be lucky.
when the vane is off recover the pin
remove that plastic cover from the hall sender plate and you will see a second circlip holding the hall sender plate down, this needs removing too, can do it now or a bit later.
remove all the screws and vac unit, fairly simple but I’d lay them out in order so you get them back right, some screws are slightly different.
pull the pin on the hall sender connector and it then slides up, if circlip is off this then lifts off
Late DG Q suffix mech ( one spring)
early DG C suffix mech ( two springs)
putting it back is easy, probably the only hard/fiddly bit (other than remembering what goes where) is inserting the dowel pin back into the vane after its on.
Use some grease on the vac unit pin/link also
don’t forget a drop or two of oil on the felt pad
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