They are useful for drilling in confined spaces such as drilling up into a studded wall from under the floorboards. I have also use a similar one as part of a setup to cut a helix on my milling machine.
I will have to use one to power drive a tube expander into the mud and top drums of a Yarrow type water tube boiler I am shortly going to start to build for my steam launch. This video shows what has to be done.
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