Kirban has one, but you have to use an old rocker shaft. Most machine shops have them laying around. I had one, but sold it and now I am regretting it. When I got mine, it was about 45 bucks. Not sure on the price now days. Use is simple. Pull your valve covers. Remove the rockers/shafts. Slide the tool onto your used shaft(NOT THE ONES GOING ON THE CAR!!!!). Then you install the shaft/tool. Then you can compress the spring. It really is easy to replace valve springs, but as with the big, fancy compressors, you have to keep the valve in place. I to have heard of stuffing the cylinders, but I have never done it that way. I guess I was always too worried about lint and debris getting in there. I guess it would all get burned up anyway, but I just don't do it. It probably does work though.