I'm changing springs and shocks on my 1991 318i. Rear is done: no problems. I've got the front strut off, spring is compressed, but I cannot get the top (center) "shock absorber top nut" off to remove the spring and shock absorber. It turns out my sad little 75 ft-lb electric impact wrench can't get it off. Are there other ways to get this nut off? (I'm thinking of filing flats onto the polished strut piston with my Dremel tool to give me a place to clamp it with vicegrips and use my breaker bar on the nut.) I've also got the nut soaking with PB Blaster overnight.