valve spring compressor

I bought a craftsman valve spring compressor and was putting some Isky toolroom springs on my 302's, they are a single spring with a damper. They bent the valve spring compressor. Has this happened to any of you? Now the heads are on, but I want to replace the valve seals, I got some new ones and don't wanna waste two good head gaskets pulling these heads back off, but my other small screw style spring compressor has arms that are too long, I can't get it to work right. I was going to run the original seals, they were fine before, but it just bothered me. I wanna do it right.