A T-shaped golf instructional tool adapted to fit over the grip end of a conventional or belly-type putter for the purpose of teaching a proper putting stroke and improving consistency. An attach bar is fixed to a putter grip using hook and loop fastened straps. The attach bar extends above the putter between the user's forearms, where two horizontal rods are fixed to the attach bar at a common junction. The horizontal rods provide feedback to the user and ensure his or her forearms, wrists and arms stay positioned together through the putting stroke. The horizontal rods align perpendicular to the putter face, allowing alignment of the shoulders and feet relative to the intended target. The attach bar can be adjusted out of plane relative to the putter swing path to accommodate different user geometry and proper posture over the ball.