5mm Allen twisted to the left and I'm post free from the frame, clean the seat tube and post, regrease and re insert. The Race Face Diabolus post has these nifty little markings so I can asses where I had the post before I took it out, and then I can reinsert to the same saddle height. Science is neat!
Sink to the 40 marking, and then snug the 5mm allen and wipe the excess grease. Ride and pray!