A robot suitable for endonasal surgery is being developed (see reference #3), however in order to optimize this robotic system, intraoperative data must be obtained to determine how the robot interacts with the patient's tissues. The aim of this study is to modify a traditional tool used in the operating room to allow determination of forces at the skull base on both hard and soft tissues. This surgical curette will be used in the standard fashion during endonasal skull base surgery, however will provide valuable information.