after trying other spring compressors and finding they all had clearance issues on my Head I found this one worked due to its large size and the double adjustment at both ends it gave clearance around the head on my 3.6L alloytec headd.The reason for 4 stars is simple, Even the smaller spring end was too large for the spring caps, I had to make an adaptor up so I could compress the springs first try every time.

After reading all the negative reviews I watched the video demonstrating it working, thought perhaps people weren’t using it right, but the reviews are dead on. This tool s utterly useless unless your valve springs are from a retractable ballpoint pen. There a absolutely no possible way of compressing an ordinary valve spring with this flimsy design and stupidly short lever which provide zero leverage as even if you are a gorilla and can move the lever, you’ll seem have fewer fingers thanks to the stupidity of the lever placement creating an unavoidable dangerous pinch point.Do yourself a favour and buy a large G clamp and a short section of alloy tube, cut a notch in the side of the tube, big enough to access the collets with a magnet.

I purchased this regardless of the crap reviews it received. I removed 16 valves and put back in 16 valves in my Holden 308 v8. Not as issue, items still look like new. All I can say is, use the item correctly. Very impressed