I once had a reciprocating saw (B&D) where the triac? a little blue box was fried. A friend tried to cut a 275 gal. oil tank in half lengthwise. The saw couldn't take the heat. Anyway, the part cost $1.25 in an industrial electronics catalog. The part from B&D came as a unit with a new trigger switch & some wiring for $18! Manufacturers don't want you to repair anything, so they arrange to make it extra difficult. The guy offered to sell me the saw for $20, so I got the saw for $21.25 & some solder. He bought a Milwaukee Super Sawsall.