Re: cordless tool 18V to 12V converter

"David Billington"  wrote in message news:ut2am8$2ev2g$1@dont-email.me...
Richard,
Have you tried or considered the old method of dry wood hammered into
the holes and then wetting it, not something I've tried but an article
here
https://www.researchgate.net/figure/Rock-split-by-using-the-swelling-pressure-of-wood-Egypt-2001_fig5_267834899
.
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I don't put much faith in academic scholars' guesses about Egyptian tech. The pyramid stones weigh around 5000 Lbs, a weight a small crew with j-bars can slide onto a flat bed truck, BTDT. I've lifted 4000 Lb logs to block them up off the damp ground.
https://www.sunbeltrentals.com/equipment-rental/forklifts/johnson-bar/1501085/
There are similar splitting cuts in stones at Mystery Hill in Salem NH, USA. The guides' explanation is that they were cut with a thin chisel for iron splitting wedges before the star drill was invented in the early 1800's. Water is easily squeezed out of wet wood.
https://mysteryhillnh.info/
A similar but undercut slot is used to lift stones:
https://en.wikipedia.org/wiki/Lewis_(lifting_appliance)
The 3 legged one was a status symbol for Church officials.