I used a hand drill to drill the holes. It didn't need be exact.

One reason I don't use impact wrench is because it could tear out the
thread. Since I used the bar, I could tighten the pulley bolt with
specified torque.

none@here.com wrote:

> I'm not sure of the exact size bolt I used. I just went to my
> local hardware store and purchased the ones that were the tightest
> fit. The method you're describing sounds much better than the one I
> used. However, I don't really have the tools necessary to make the
> tool. It sounds as though you may need a machine shop to accurately
> drill a thick piece of channel iron (that is a brilliant idea though).
> FYI, I took it to a local garage and I gave the mechanic 5
> bucks to crack the bolt for me. Even the mechanic was surprised by the
> amount of power required to loosen the bolt. It took him approximately
> 2 minutes using a heavy duty impact wrench. Interestingly enough, when
> the mechanic was loosening the bolt, the crank pulley didn't require
> any bracing. I just pulled up, and then he told me to crank my wheel
> all the way left. Next, he reached under the front wheel well and
> inserted the impact wrench into the service hole. It seems like air
> tools can make mechanical work much easier. It's too bad they are so
> dam expensive.
>
> Later,
> Curt