https://www.brickboard.com/GALLERY/volvopic.htm?js_link=&id=13146

Well i thought I'd loosen that top nut while the strut is secure in the car vs clamped in a cheezy vise. Setup is in the picture, includes a tool which holds the 9mm strut flats from turning. The nut won't budge, next step could be to HEAT via chezzy MAPP + Oxy gas torch or buy a real 21mm combination wrench with a long handle. I did jack up the a-arm to level, which probably relieved some pressure on the nut but still No go. Kroil applied earlier in the day. I try not to damage old parts, in case I never get them removed. That circular disk - black below the difficult nut seems to have a rubber coating on it, so I'm not sure how brave I can get. Cherry red nut - well not until i get real frustrated. So HEAT or buy an Earthquake lithium Impact Wrench or real 21mm wrench or ...? My index finger is black and blue from tugging on that wrench despite the big rag.

Yea , being a tough guy i didn't want to buy the complete strut kit that you just bolt in. COmes with spring and all. It's not VOLVO though.