I have an old barn on my property that's been looking like it will fall down for about 20 years. The roof is still intact, and the timber frame is in good shape. It's fallen off its foundation, and one of the four bents is missing. I tried pulling it down with a tractor, but only managed to rip off one end. The oak pegs are holding fast, and any attempt to knock them out has been futile. Any suggestions?