We're sure you know what a chore it can be to try to remove high pressure valve springs while the cylinder heads are still on the engine, especially when you run a shaft mounted rocker system. Finally, there's a quality built, heavy-duty spring compressor available to meet your needs. Our tool is easy to use; simply bolt tool shaft in place of your rocker shaft, place tool feet over retainer, slide on handle and pull down to compress spring. Once the valve locks are removed just flip the tool out of the way and remove valve spring. Reassembly works just as easily. Note: This tool is designed to work with Jesel shafts. T&D, Crower, and Clinch shafts may require slight tool modification.