I am considering purchasing a strut spring compressor and then want to change some struts. I see the real cheap ones that look like threaded rods with a hook at each end. But the ones I like (from HF) are a hydraulic ram (and included pump) along with two sets of plates (smaller and larger) that are shaped like a "C". Then there are ones that look like two attached arms with a threaded rod to pull the arms close together (and compress the spring).