Motion Pro Harley Fork Spring Compression Tool (41mm) Motion Pro is dedicated to producing the most versatile, unique and durable products for professional and home use. Motion Pro tools are designed to be simple to use, yet durable enough to withstand the harshest conditions. One of their goals is to offer tools of convenience. Do it right the first time with Motion Pro Tools. Designed to install fork caps on forks with a large amount of spring pre-load.