Rereading my post, it sounds condescending. You even metioned having a MityVac in your earlier post. My apologies for being a jerk.

Yes, it does sound like the actuator is worn. It should snap down with only 15" of vacuum. You should be able to suck on a hose with your mouth to kill the engine. I wouldn't try it because there could be engine oil leaking into the actuator!

The link didn't work for me but I believe you mean the page with two aluminum things and a brass thing below. You want the brass thing. I don't see the plastic alternative with the nipple on top that was available previously. I've had a couple of 603s apart and I've never seen those aluminum things.

Do a search for DaveM/gsxr's instructions on removing the ALDA without removing the intake manifold. It makes a much quicker job of replacing the actuator. If you're due for glow plugs and injectors clips, might as well pull the intake manifold.

Good luck!

Sixto
87 300D