I have new splined hubs and new knock offs that will not stay tight. I use a rubber mallet to tighten them with and wondered what is recommended. I would hate to dent those knock offs. I could go to a dead blow hammer but will use the brass metal if that is what it takes. I do remove the wheels quite a bit to work on cleaning and such which brings up another note. I did put a little grease on the hub threads before hammering on the knock offs. Is that the culprit? This is a simple newbie question but all advise is appreciated.