Slightly off the topic, and not answering the question you asked, I have a
suggestion for a neat alternative. Aircraft Tool Supply (and others, I'm sure)
sell rivet guns that hammer a rivet against a bucking bar. REAL rivets, not pop
rivets. I bought one of these to use on my Cobra project.
The biggest difference between these guns and the impact hammers from HF is that
the rivet guns have a teasing trigger. It controls like an accelerator, slow to
fast, low to high impact. While essential for riveting, I found that with
cutting heads in particular these give superior control over your task.
ATS brands are currently on sale for $100 or less. I think they have their
least expensive one available for $85.
> I picked up an air hammer from Horrible Freight yesterday and the power
> is dismal. I tried to use it to bust some tie rod ends and it wouldn't
> budge them. The impact force feels about the same as taking an 12 oz
> hammer and letting it freefall about two inches. It's been about 20
> years since I used an air hammer, but I remember then trying to shake
> themselves right out of your hands. Is it defective? Am I expecting too
> much of an HF tool? Am I using it wrong?
> It is item 47868. Normally $29.99, it was on sale for $9.99.