Methods and apparatus for modifying the bone portion of a graft, such as that used in the reconstruction of a damaged anterior cruciate ligament. Embodiments of the present invention comprise a driving member for threaded engagement with a housing member and a cutting member engaged with the driving member. The housing member is capable of receiving and supporting the bone graft without damaging a ligament attached thereto. Upon rotation of the driving member, the cutting member will engage the bone portion of the graft and modify it to have a generally circular cross section.