Look at the Unique Taper Shaper or contact Chris Hightower. Other method would be if you have a lathe offset your tailstock since you said for butts...
call mike johnson jensen cues he has a new tapper shaper you can save big bucks 3000.00 new machine never used he will take much less call him
225 924 4517
I build a tapering machine for $2900 that uses a router. I also have a table saw tapering machine that I no longer use for $2000. It must be picked up in Georgia.