Yeah, I also have a 600. I still sew on the 401, though. Mine is also an auto-reel, although it has a "Touch and Sew" label posted over the auto-reel one. Unfortunately, I've never finished getting it all cleaned up. It's the dirtiest machine I've seen that wasn't in storage for a long time. It's just coated in old oil and lint in every nook and cranny. It's a two t-shirt clean-up, for sure, but life got in the way of sewing machines.
bkay