Easily remove the crankshaft bolt on a Mazda MX-5 NA or NB engine with this locking tool. The crankshaft bolts on an MX-5 can be extremely tight, and using an impact wrench for removal and installation is not advisable due to the well-known pulley wobble issue. With this tool, you can very easily block the crankshaft after removing the crank pulley and use hand tools to loosen the bolt. Once you’ve finished replacing the distribution, it can of course be used to torque everything down. In short, a very valuable tool that makes replacing the timing belt on a Mazda MX-5 many times easier.