Removed Bilstein PSS9s rear springs, but the rusted 29mm bolt & nut holding the bilstein spring perch on is now seized. I let it soak over night of course before taking a socket and wrench to it. I got the nut a 1/2" up the rusty bolt threads before the nut decided to seize onto the bolt with another 1/8" to go. any suggestions? torch the nut? ideas?