Straigthening a concrete spur / fencing

I have a few fence posts leaning over into the neighbours garden, they haven’t moved in the 6 years we’ve been here.

Its time to replace the fence so looking at options to realign the spurs.  There are seven of them, with a large amount of concrete underneath.  all are out of line to some degree so I suspect a bodged DIY job

I have read you can chip off the concrete on the side that needs to be straightened, reset it with a level and then add postcrete.  This would be a lot cheaper than digging all seven out and replacing.  wife does not want full concrete posts, and as its me on my own I’m not keen on trying to replace with a full concrete post either

Anyone tried this in the real world?  My concern is by digging a big hole then smashing off that concrete it won’t be hugely stable.

I have access to a jack hammer and large concrete saw.

Bonus question what size are the bolts that go through a standard spur?  I’ve tried measuring the old rust ones and they look to be 9mm, I was expecting it to be m10

Can’t you shave wedges off the wooden posts so that the posts are vertical even if the spurs aren’t? Or add wedges between the spurs and the posts?

Spurs probably all have different size holes, I used M12 bolts on mine but it was tight and they needed tapping through with a mallet.

Possibly I could try shimming the posts, hadn’t thought of that.  Would be worried about the shims detoriating quicker than the posts and having a wobbly fence in a few years.  It would probably take me just as long to do it

I can’t get any of the bolts out to be able to measure the holes properly.  Going to have to cut them out

Dig around them, straighten then add postcrete around the hole.