May only be for light/moderate spring - Firstly, Summit Racing is the absolute best: best people, best service, fast delivery, everything. For this product (OTC Universal Overhead Valve Spring Compressors 4572) it looks great and seems to fit the basics when it first ships and it seems other people have had great success with their vehicles, from the 1.9 -liter Passat to ZX6R motorcycle. Volkswagen 2.0 2006. But for people with heavier springs, like me, this tool is not enough. I used this tool for the first time (today 9/14/17) on TFS-30410003-M64 Trick Flow small-block Chevy heads. I found I could use the lever to compress a little and then a twist screw with a slide bar on the other end to compress the spring even more. The problem was that on the 6th spring the threads had failed and it would now not turn freely (the threads actually rolled in the nut and now requires a lot of force to turn the damaged area). Even with the tool, the rubber bushing above the lever slides up and down in use, even for that short time (very annoying having to keep pressing down, especially in the middle of the "upset". And finally the "Half-Cup" "- Steel disc that contacts and presses against the valve has a very sharp edge and can potentially damage the surface of the valve. I find that these tools work well with lighter springs (after all, the video I watched on YouTube shows a pregnant woman using it with no problem ) but if you have an application for heavier springs maybe check out the LMS Racing spring compressor on the Summit Racing website too (it's a lot more expensive but definitely for heavier springs ) -- no lever, just spring compression screw -- If only the screw on this OTC unit was the same quality and size as the LMS, with surface coating on the part contacted with Valve.)
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