Abstract: A rotatable tool for use in repairing composite hollow shafts, namely for sports equipment, for example, composite hockey stick shafts. The rotatable tool includes a plurality of aligned spaced-apart grinding surfaces and proximal and distal guide bearings coaxially arranged along a tool shaft. The rotatable tool is used to form grooves proximate the repair location so as to enhance mechanical bonding of a composite repair material which spans a region of abutment of hollow shaft segments.