Report "My sister bought me a Riccar Lock RL 333 serger a few years ago. When she bought it, it had only been used a couple of times and was brand new. When I have tried using it, the stitching seems extremely loose. I have followed the manual and tried to adjust the settings but it doesn't seem to make a difference. This machine, I think, is over 20 years old. Would you recommend having it looked at by a professional or is it old enough that I should purchase a new one? I don't know much about Riccar's"