The Viking 6000 series are great machines, they have a low gear that will do full power at 1/5 speed. The machines have a weekness in the internal cam gear - it cracks. Viking no longer makes the part but there is a good aftermarket version available now. I had a 6440 I got from freecycle. It came to me complete but had the cracked cam. The best place for information is the yahoo group "vikingsewingpre1980" There is a lot of information on working on these machines in the files section of this group. The group also has a list with Viking techs who know the older machines and can work on them. I was able to find one about an hour from me and had my 6440 rebuilt at a cost of about $250. It was a great machine after that and I ended up selling it to my SIL as I found a 6020 to adopt that had been left at the door of a local thrift shop. It also had a cracked cam so back to my tech I went. That on I still have and designate for my husbands use.