I think my Disa valve is broken too...

There is no sound when idling, but if i rev the engine a bit, there is a rattle/crackling sound coming from the top of the engine on the drivers side...

Ill post a video clip later and see if you guys think it is the disa..

Is it a easy screw loose and replace operation..?

Anything i must beaware of, or which needs to be lined up or adjusted afterwards.?