First I would check the problem and then find the cost of the replacement part. Replacement parts are pretty cheap on Ebay. You might have to do a little work for a part number on Parts Tree. I have had the same Craftsman Weed eater for 21 years and I ve replaced the bump head (just the bottom piece) twice. They are plastic and they bust after repeated bumping, but they only cost $5-6 bucks. I replaced the main shaft last year for $22.00, now that might be crazy on a 21 year old Craftsman , but at this point, I want to see how long this thing is going to run. It still runs super strong, besides air filter, gas lines and filter. Its bone stock. Don't listen to those Echo- Stihl heads. Buy the best you can afford and take care of it and you will be surprised how long it lasts. A lot of cheap weed trimmers get bad raps, but its the idiots that buy them. Most times a guy that buys a Homelite at Walmart for $69 isn't going to maintain and pamper it like the guy that pays $200 for a Echo at Home Depot and surprise, it doesn't last. When or If this Craftsman ever dies, before me. Ill buy another $69 one and run it the same. That guy that said buy a electric one, just tear up your man card now. You belong in the kitchen with the other electrical appliances.