I got my old ones out with a blow torch. There was then a metal sheath which I had to cut through with a hack saw and then hammer the shite out of them to get the metal sheaths out.
Putting the new ones in was easy with a bit of fitting grease for a couple but the majority were right brass studs. The first photo shows the metal sheath before I realised it needed removing
Then I got an engineering mate to help
RESULT!!!!!!!!!!!!!
![](https://lh5.googleusercontent.com/-UItnosRObWc/T3f_K3myfcI/AAAAAAAAB8Q/tOOmYTH7NI4/s640/2012-03-31%252010.17.27.jpg)