Hoping you guys can help me out. I have a consumer model Husquvarna string trimmer and will be using it pretty hard in a couple weeks to help my mom clear some of her property. Sorry, I can't remember the model number off the top of my head, but it's the model that accepts different attachments. Anyways, I would like to change the grease in the gear box at the trimmer head as I've had it almost 4 years now and its never been done. If I remember right, the owners manual never really says what to use and I was wondering if anyone here could tell me. Thanks.