Front TC arm bolt

How do guys,

I've bought some aftermarket TC arms to replace the stock items with ruined bushes and yesterday spent a good chunk of time trying to remove one however I couldn't for the life of me remove the bolt that holds it to the chassis out all it would do is spin withe the metal insert of the stock bush.

I gave it a bash with a hammer but nothing happened and didn't want to go to mad and bend anything to find out there is a trick to getting them off without damage haha.

Any hints or is it get a bigger hammer time lol.

Adrian.