Further to my earlier answer - how old is the machine - mine's about 15+ years old and is still running well.
Lining up the slant adjustment is the most important thing to get right. After that, the set up of the blade guides and bearings (hence the need for the user manual) After that hey presto - its done. (otherwise, sweetheart a guy in your local B&Q - sure they will do it for you in minutes.)
Jim Martyn, May 2009