I ordered the cheap one yesterday - it looked okay to me. When it comes in
I'll find out! (Shipping to Arizona was about $11, not included in the
displayed price when I ordered it.)

Mike

The tool came in the mail three business days later, and shipping was $6.20.
It fits well and is made of stout steel, welded and machined, painted black.
It even came in a box with the models that it fits identified on the label.

Yesterday we tried it out, using the tool with a breaker bar and jack stand
to hold the pulley. We put a regulator at the input of a 500 ft-lb 1/2 inch
drive impact driver and ran the hose at 130 psi to ensure good 90 psi air to
the impact driver. (I measured the average drop of the 3/8 hose to be 20 psi
with the driver running no-load.)  I didn't notice if the bolt started
moving with the first 3-5 second burst, but a couple seconds into the second
burst I could clearly see movement.

I suspect if I used a lower torque driver, didn't put the regulator at the
tool, or didn't use the holding tool it wouldn't have worked. It sure didn't
work when we tried it without the last two details!

Mike

Thanks, but I'm pretty sure these won't work.  The 2.5 pulley does not have
the hex hole in it.   I couldn't find the tool, so I improvised.  I wrapped
pieces of the old belts around the pulley and then wrapped that multiple
times with a tied down strap.  I then slipped a breaker bar into the strap
and used a wooden brace on the engine compartment to hold the breaker bar.
That finally worked.
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Alex