Can someone quickly remind me? I am restoring an old fighting chair and need to remove frozen stainless steel bolts from an aluminum frame. Tried Aero-Kroil and PB Blaster to no avail. Have access to heat. Do I heat the bolt or the frame. Have concerns about getting the frame too hot and annealing(?) the aluminum. May have answered my own question there. Any help or other ideas is appreciated. Thanks...