Easton's standard uni-bushings made for Easton aluminum arrows that are 20XX and larger that use a S-type nock.Which is any nock made for a .246 ID,like Super nocks,3D Super nocks,Bohning Signature,GT,nocks and other shafts with the .246 ID.They do have G-bushing with a .166 ID bushing for aluminum arrows that will use a G-nock that will fit larger diameter aluminums as well as smaller diameter aluminums.They also have a X-bushing for 1816,1913 and 1916 that will accept a X-nock(same nocks as an Axis) that has a .204 ID bushing.To remove the uni-bushing I would heat it up and pull out with pliers.They do have nock adapter that glue in in place of the bushing that are size specific to the arrow.