[Pilgrim]

Been using Aero-Kroil for 10+ years. Good stuff.

Best bet is usually a combination of penetrating oil, patience, and heat. Sometimes torch heating will break things loose when nothing else will. Problem for a mechanic is that they're paid by time and not eager to have stuff sitting in the shop for a couple of days. But if they can hit it with penetrating oil and park it for a while, that should be OK