Trek Madone Seat Mast Cap stuck

sparkins1972 Posts: 252
edited September 2010 in Workshop

I have just bought a second hand Madone 5.2 and it is the first time I have come across the seat mast. I need to raise the saddle slightly and have loosened the two allen bolts on the clamp but I cant get the cap to budge - is it just a case of brute force and ignorance to get it shifted or is there a secret to it?