I need a large tapered reamer for an oversized hole in a pump jack arm, the wrist pin hole, I don't have the arm yet but looked like I would need to be over 2 1/2 inches on the large end and at least 6 inches long. the next question is Tree the only taper boring head and would it do a taper 4 1/2 inches long or are there other manufacturers of taper boring heads.