If you damage the thread on the lca bolt just turn it off with a breaker bar and use a new lock nut
Trouble is, it'll be seized into the bush in the LCA, which means new bushes, or easier option, new LCA's
Yea...that bolt didnt even need to come out mate. I have just always undone the bolt that holds the LCA to the subframe... much easier
can you not grind off the other side where it is threaded in to . this way you can pull the bolt out then just replace it with a bolt and locknut . will do the same job