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Brass works best since it has less tendency to waste applied energy by rebounding, since it is softer. Glancing blows also waste energy; you'll know by feel when you hit it flat. Remember that energy and mass are equivalent, according to Einstein, so don't waste 32oz of available mass. Another good use for the "Einstein's Mallet" is to tighten or loosen bolts or nuts: place box end wrench on bolt or nut head and apply pressure to the wrench in desired direction. WHILE MAINTAINING hand pressure on wrench (preloading), smartly "bop" the end of wrench in same direction. This is effective for large front wheel drive nuts also, but the key is to make sure the wrench maintains a preload on the assembly--in this case preload wrench with heavy load AND with full weight of car on the axle. Also good way to tighten or loosen oil drain bolt...a slight "bop" on end of preloaded box wrench does the trick.
Only drawback for the brass mallet is over the years it mushrooms more and more. I'd like to see a toolmaker install a tight steel sleeve around the business end to stop or slow the mushrooming.
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