When I did mine prior to the garage changing these I dowsed the nuts, the captive nuts and the bolts with good quality penetrating fluid. I kept doing this over a number of days. When it came to changing them the mechanic that did these told me that they came apart reasonably well - he showed me the original nuts and bolts and although they had been on the car about 17 years they could have been used again, although I replaced with new. The captive nuts are accessed via a hole in the subframe
I also made sure the new arms were well coated with wayoyl
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