This is just a guess but I think that a light weight dolly might be useful for the very final stages of hammer/dolly work. A direct on dolly strike might react a bit like off dolly work because the hammer strike would push the light weight dolly along with the sheet metal instead of thinning the sheet metal as happens when using a heavy steel dolly. It's a little counter intuitive, similar to using a magnesium planishing hammer. Seems a person could make light weight dollys from 7075 T6 aluminum for much less money than ti.
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Bob
Don't believe everything you think.
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