I think the lines between hobby and business ARE blurred. If it is to be a business, it needs some sort of organization to it or it could get out of hand and crazy. I have been looking at how to best tag a machine - what needs to go on a tag??? they come in and then I don't know what is going on in another month. I don't need to be looking them over more than once I guess. Some times I just don't have time to fool with something or don't have a certain part. I try to order parts all at once to save postage. Some times I take a day just to work on tensions that need to be torn down. That way I keep in practice. There are different types of tensions, too. I think there is just so much to learn about the machines. I doubt if anybody ever learns all of it. I've seen the repair man get stumped. I know the repair man knows basics and then has to look up what he doesn't know specific to a machine - too many odd machines out there aren't there.