Since I only put the pic on there, without measurements, it's possible to fabricate it so it doesn't work, however I used the one I made on 3 different motors with no problems. Each motor had never been apart & one was quite rusty/grungy. The real trick is to tighten the bolt down pretty tight. stop. & then wack the end of the head of the bolt so it jars it loose. Should just pop apart.