I am replacing the lifters on my 2000 Jeep with the 2.5l engine. I know on the 4.0l you have to remove the head but on the 2.5l you don’t. I have taken the old lifter out and currently have 2 new ones back in. I still need to put 6 in but I can’t get them to go back into the holes. I have been working on it for a few hrs and can’t get another in. Any tips on getting the rest in?