2006 340DA 8.1 V-Drives. Pressed start button (port engine) and starter motor spins but the bendix gear does not engage. I can see and it looks like I can get to this without a tremendous amount of effort..but experience has shown things are not as always as easy as they look. Looks like the correct Part Number is 50-808011A05, and only a couple of bolts holding this in. Anyone here replaced this before? Any "gotcha's" I should look out for? I do remember in the old auto days, you could whack the starter housing with a hammer and it would sometimes work..Any other ideas or suggestions?