Dude i couldnt resist the itchyness, and decided to open mine up. Cleaned everything with dry kitchen role, put it together and works the same way
If you ever decide to take it apart (which even tho i did, i strongly suggest you dont), make sure you remember how many turns and so on to remove stuff.
Never oil internals as cockers tend to pick up more crap in them, because of moving parts. The oil will mix with the crap, and create a kind of paste, and will wear the internals and body quicker.
I have been told wdp love juice is good on the bolt, and also vaseline, but vaseline is a bit thicker than love juice.
Hope that helps
Darren