The Bolens 753-06165 Trimmer Gear Box Assembly helps transfer rotational power from the trimmer shaft to the cutting head for reliable trimming performance. Designed for compatible Bolens trimmer applications, this assembly supports proper cutting-head operation during routine yard maintenance. It is a practical replacement for a worn, damaged, or faulty gearbox that may cause unusual... https://www.wholetoolbox.com/bolens-753-06165-trimmer-gear-box-assembly/753-06165.html