I bought a fs850 used tiller I soon found out well used ! the chain had been ran loose and had cut through the bottom of the side gear box . i have welded it but it had broke teeth off the sprocket . Im having problems removing the chain tensioner and chain . The local dealerships say they have never worked on one and dont seem to know a thing about it . Any suggestions ? Also does any know of any salvage yards or a cheap parts dealer ? I paid $500 for it so I hate to scrap it ! Never never buy an attachment without seeing it operate even if it's a nice older gentleman that is just getting to old to garden !