The Actuator is actually made by Hella for Garret Turbos, here's the link to the one I bought, arrived quickly, good kit, no fuss no drama :wink :-
New HELLA Electronic Turbocharger Actuator Repair Kit Type 1 Motor Clip Worm
As well as the Clip holding it, the Motor has 2 tiny Screws at the opposite end to the Gear, they go through the Actuator plastic Casing and the Screw Heads are blanked so you have to dig the blanks out with a wee pick, I then put a dob of Silicone over them after I'd changed the Motor to seal it all up :wink
Regarding the Turbo Stud Nuts, they will be rusty, soak them with WD 40 or similar, then a 13mm Spanner on them and wriggle it will clean off the rust.
After this if you think the Spanner is moving too much and will round them, don't try and undo them, use a 6 point 1/2" AF which will be a tighter fit than 13mm, and if they are really bad, try and get a 12mm 6 point on them.................
I've done loads of these on various CDI Engines. In NW Scotland, the environment is very Salty, and everything rusts :laugh
I've found that this method always gets them undone.
I've only ever had one nervous moment on 1 Nut on a very old Sprinter Van, but forcing a 12mm on the nut by wiggling and Lever Bar got it undone :wink
When taking the Turbo out, leave the Oil Return Pipe attached to the Turbo, and get it clear of the Manifold Flange, then wriggle and twist upwards so the Pipe pulls out of the Seal in the Cylinder Block.
With Turbo on the Bench, undo the Pipe and change the Gasket, but leave the Bolts loose, so the Pipe moves whilst you get it located back in the Block Seal, lube the end of the Pipe, it is very easy to tear the Seal, you can then tighten the 2 Bolts when Turbo is bolted up, but you can't get the Pipe on the Turbo if you try leaving it off until last :wink
Finally, order all new Nuts and Gaskets, and an Oil Return Pipe to Cylinder Block Seal (a little Rubber "Top Hat" that is very prone to leaking) etc etc from MB themselves. The last set I bought recently from MB was around £14.00 for the lot, EBay Chinese sh!te Gaskets were similar price, and didn't have one of the ones you will need :wink
Put the new Top Hat Seal in the Block First, and then the Pipe slides into it, grease it inside and out to avoid sticking / tearing :wink
I think that's about got it covered :grin