It's not just a case of a quick seat cut and a new seal , I had to cut 6mm's out. I tried four seat cutters first 2 were brand new all cleaned the seat but I would have been there all day trying to cut the 6 mil they just skimmed the surface. You need to get the new seat perfectly flat and good enough to seal against then I had to make a new sealing washer the correct size to ensure the tip of the injector was at the correct height. I ended up making a cutter that fit the hole so it was guided and couldn't go off line and into the water jacket, and also so I could control the depth it cut. it took a while but I was really pleased with the result. I asked around my usual suppliers to try to get a bigger seal and looked on the internet but no one could help, hence I had to make it.
I'm now adding it to the line up of mobile jobs we offer out.... Another first !! (We were the first to offer a mobile seized injector removal service years ago)