I have a custom made cue that is brand new, and one day after I had played a few games I thought to roll it just to see the straightness, and to my surprise the joint bounced up and down, and I know some have said this is no way to check a cue. But if something is straight it will roll flat across a flat surface, well this cue does not. Well I sent the cue back to the cuemaker, which in return told me that the cue was perfectly straight and the bounce I was seeing was the compound taper that he uses on the cues, My question to you all is? what is the purpose of a compound taper? and what cue makers are known to use them? And if your cue has a compound taper does it bounce up and down as it is rolled across a flat surface? Thanks for any insight.