SO I just bought this compressor so I can get at my exhaust ports better on the D0VE-C heads but this thing is a POS. The handle to crank is so small you cant get any leverage for the clamp to push down on the spring. So I put a wrench on it for more torque but the clamp bar bends and the c-clip slides off the retainer and whacks the spring and valve cover surface. I'm so pissed. Then they say once the valve is down, remove the locks and then slowly release the release lever while holding the crank so it doesnt spring back. Yeah right, just the mm I pushed the spring down made the crank impossible to hold on to when pulling the release lever. This tool could kill someone its so dangerous and worthless. Now I've got a jacked up retainer and scratched spring. I think I'm going to talk to a manager at Pep Boys when I return it so maybe they take it off the shelf.