take the plastic cover off the reel. inside should be what looks like a white plastic cog or wheel. inside that is a ball bearing or a locking pin. you gotta stop that from moving, pull enough out and put a clamp or something on the belt to stop it going back in. release the ball bearing or pin. bolt it in. take off clamp. ta da!!!!
thats how i do my escort ones, transit etc etc
hope that helps
scott