When we had to remove the injectors on our diesel
engines (I can't remember the make - but they were big, noisey red ones, if that helps) we couldn't get enough grip on them to pull them out after unscrewing them, as they were being held in by the rubber seals
, and there actually wasn't that much to actually get hold of.
So we used a spare injector pipe - the bit with the nut on which would normally screw down onto the injector - and fastened that onto each injector in turn, and then pulled and heaved on that. It supplied sufficient grip to allow us to pull them out with barely more than grazed nuckles and a few choice words.
Notice the use of "we" here. As we are a team, the engineer
did the work whilst I observed!!