Take the SCREWDRIVER (L).
Remove the screw with the SCREWDRIVER (M); take the DETAIL (N).
Collect the SCREWS with the SCREWDRIVER (O).
Insert the SCREWDRIVER into the detail (P); take the DETAIL.
Put the 2 DETAILS into the mechanism (Q); insert the SCREWS into the mechanism and fix them with the SCREWDRIVER.
Enter the Vampire's Room.
Take the CLOTH (R); look at the vampire (S).
Take the TWILIGHT BROTHERS COAT OF ARMS (T) and the ACID (U); clean the box with the CLOTH (purple) to get the code '3179'.
Talk to the man (V); you receive the COPPER SKULL.
Walk down three times.