Coilover bolts

[Igork15]

Im having a problem getting my coilover bolts off to put on my strut bar. One of the nuts wouldnt break loose for shit and when it did the whole bolt just went spinning with it haha, I looked in the wheel well and see it popped out so i hammered it back in and tried again and it just keeps popping out, I tried keeping in place with the hammer and as soon as I start turning it it just pops out. Do you guys have any idea how I can get this last nut off? Thanks