I was working on my nephews 2005 F150 changing his spark plugs for the first time. Truck has 130000 miles on it. Bought the lisle tool, before beginning the job. Began on the drivers side, first two broke off, tool worked great. Began working on the third one and it broke off, and instead of the shield coming out, it stripped metal from cone. Now I cannot get a grip of shield to pull on. I am sure somebody has had this happen to them...Any suggestions?
I second trying to press the ceramic down further. Probably will cause particles to drop into the cylinder, so consider trying to vacuum it out (different opinions out there on necessity). Also, double check the Lisle thread. On my 7th broken plug, the thread stripped and failed to pull the shield out. Found a replacement thread tool on ebay.