The thread of the bolt on my gearbox assembly is not long enough to install the Tri-clone Trimmer Head, how can I make it fit?
If the thread on the bolt of your weed eater’s gearbox assembly is shorter than 10mm with the dust cup in place, then we recommend that you replace your dust cup with a steel blade adapter (Echo part# C535000100 for Echo/Shindaiwa) to allow more tightening of the bolt.