CTroy;
A bushing placed on the end of the reamer shank of a size to just be an easy sliding fit in the bore would keep the reamer in line. The lead taper on the flutes would center them as they made contact with the cone. I would not see a lead pilot as necessary for this purpose. If it was you would have to make a new one every cut. A good way to fit the bushing is after determining the needed size fit an oversize one to the reamer shank & then set the reamer between centers in a lathe for turning to the needed size.
