Apologies not rotary but here are my 3 sessions if your bored and want to whittle away some time...
http://www.youtube.com/watch?v=10IcpKIBUcE
http://www.youtube.com/watch?v=KUO9haay7cg
http://www.youtube.com/watch?v=Htr-BKoyPx4
pushing very hard in all.....:3gears-lh