Abstract: A rigid tube extending along an axis is provided with a rectangular cross-section having enlarged centrally disposed arcuate sections for receiving tubular structural portions of walk assist devices such as canes or crutches. The rigid tube is provided with patterns of threaded mounting holes that accept locking machine bolts extending through mounting holes in a mounting plate; the mounting plate is provided with an arcuate groove for contacting and clamping a structural portion of a wheelchair or walker.