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.
Many TIA.
MF