Mono link rail (storck) problems help!

Hi guys think this is the right discussion to post this. I was on here for years under devonroads but lost access to that email due to work. Anyway back in the bike after 3 years lay off!
I bought a 2nd hand storck and it is fitted with a very bling carbon post with selle italia saddle. However the cam system is completely jammed. On unscrewing there was a lot of rust on one of the bolts and what appears to be oxidation.
To get the saddle to move down the rail I literally had to use a hammer. Its nearly off but won't go any further. Help please any ideas? I was originally looking to get a rail kit and fit a romin. I have bought another post now but I'd like to hey this one working. Thanks Jon