I'm going to have to replace the timing belt on my Fiesta Zetec soon. Haynes show a home-made tool for holding the crankshaft pulley while you undo the bolt, but also mention a locking pin for retightening. Now, I do have the locking pin (not just the timing pin). Could I also use this while undoing the bolt, instead of having to make the other tool? I'd have guessed you could, but I don't want to snap it into the crankcase.
Also, why do they say to remove the cam sprockets? Does this mean that there is no key on the crankshaft, and that since you are unlikely to get the crankshaft sprocket back in the same position, you need to be able to reset the camshaft sprockets more precisely?