I have a Harber freight belt sander that has been really good for me, especially given the price. Lately it has been making a lot of noise--squeeking. I don't know if it is the drive belt or the bearings. Does anyone have any experience servicing one of these sanders, or do I just put in earplugs until it breaks and buy a new one? With this Chinese stuff, it is hard to say what is fixable and what isn't worth it.