On a DSM, you could probably do it with a screwdriver if you had to, but on an evo, you really need one of these tools. The tensioner pulley spins the opposite direction on 7-bolts and it is (of course) an awkward spot to put a screwdriver, angled pliers, etc. It's one of those spots I usually end up doing and re-doing a few times to get the tension right and timing marks all lined up. Having the right tool should hopefully help
