Nothing new on the concept but with a couple of design changes using materials I had to hand. Not liking the exposed wiring on the ones I have seen I have enclosed it within the handle, the on button is operated by a finger grip instead of the more usual thumb. I also fitted a 1/2 inch drive to accept sockets as I have two different machines to use it on. This is powered by my 18v drill battery power box which has variable speed.
Parts are
24v 40;1 ratio unit
Momentary on button
32mm waste pipe (gives some air space for the motor and wiring).
2 acrylic end caps.
8BA C/S screws.
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