I put a little spray of my very special grease behind the thrust bearings on the HB2. Not hard to do as it goes in as a thin spray foam and quickly congeals into grease. A double shot behind every thrust bearing was perfect.
HB2 runs like a new machine! Wow, it is really more effective than I imagined. I just ordered a mini grease gun with this brand of lube to use on the linear bearings. Good stuff!