Tool does not go in deep enough to engage or disengage valve stem keys. The key access cutout should be higher. Maybe double the height. I used a washer as a spacer and it helped. I bought a longer screw to fix the problem. You just have to be careful not to drop it and push the valve into the cylinder. I order several different valve spring compressors, this one needs improvement but it's a good concept. 2005 Ford F-150 3 valves
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