I'll preface this by stating, I'm a brand new turner. I was given a brand new lathe. It's the harbor freight 10x18 that is also sold by rockler and several other companies, I believe. It has been a great little lathe thus far. However, I've noticed on longer pieces, I get some chatter near the tail stock end. I'm using carbide lathe tools. Pieces are driven by the stock spur center. Vibration lessens near spur center end. Is this normal?