Well, if you can see the bolt, but can't get to it, chances are you will need to attack it with a cresent or box head wrench. Otherwise, you may be able to use a universal joint through it.. but the box head is the best of the three. Because I believe all our pullies are press fit, and require a special remover, and that wouldn't help any. By any chance do you know the pulley in the way? Could it be the idler? [the idler is the one with the 18mm bolt that you use to apply tension to the belt, or remove tension to remove the belt].