The job was made easy with the simple injector puller I made last week at work. I simply welded a 12mm x 1. 5 nut (injector top thread) to a 3/8-16 nut. Add a 12 inch piece of 3/8 threaded rod (I have a bunch at home), another 3/8 nut, and a drilled out piece of bar, and you have a puller. I started with a shorter piece of rod, but this length gets the injector out in about 5 whacks... also is short enough to get number 6. Pic in my reader's rigs.