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kind of off topic but I watched a tv prog on kit building a house and they filled the walls with polystyrene boards, then heated a large ball bearing with a gas torch.
dropped the ball onto the poly and it tunnelled it's way through like the ship in "the core" and fell out the bottom
They ran all their cables that way
dropped the ball onto the poly and it tunnelled it's way through like the ship in "the core" and fell out the bottom
They ran all their cables that way