I have recently worked on a 600 & a 600E. The 600E is a Touch & Sew. If the belt is in the same place as as it is in these 2 machines it is gonna be difficult to get to. Notice I didn't say impossible. If I were gonna work on your machine I would first charge ya a service/cleaning fee of $112.50 (a requirement for all machines I work on as I know all the extra places that need grease & oil) then I would charge ya for the belt & a dollar a minute (for how long it should take me to do it) to put it in. Around $30 for my labor. I have never turned down a machine that needs work as I truly wish that all machines could be fixed. Now I have found a few that couldn't be fixed but I have never just said I don't want to.