MF wrote:
Not a marital aid, and not explicitly home repair, I'm looking for a quarry
workers tool.
I need to break up a large irregular chunk of concrete (maybe 4x5x2 ft) and
I saw a technique on TOH some years ago for splitting granite - called (I
think) plug and feather.

It involves a line of holes drilled, and a series of devices hammered into
each, simultaneously. the devices, a pair of L shaped 'feathers' surrounding
a tapered steel 'plug'

Anyone ever heard of a source for these devices?

The concrete is probably very hard, having cured at the water's edge,
semi-submerged.

Any source - or better idea - would be MOST appreciated.

Renting http://tinyurl.com/78hw6 makes the most sense if time is of any
value to you. If you like exercise and consider it a challenge (the
tree stump in Shane), you could drill a bunch of holes along a line and
use _very_ dry wood wedges pounded into the holes, then pour water into
the holes and on the wedges. The wood will expand and exert tremendous
force. The block will split along your line. If it doesn't, you
didn't drill enough holes. This is how the Egyptians quarried the
stone for the pyramids.

R

R