Abstract: An accessory for use with a power stretcher when installing carpet. The accessory is used at the rear, or tail of the tool, and is removable. The accessory has a plurality of pins for engaging the floor while stretching. This feature renders the stretcher more stable, and reduces tendency of the pins to penetrate a floor excessively. A second important feature is provision of a surface on which a user's knee bears, to increase downward force, while leaving the user's hands free. The pins are smooth walled, so as not to snag carpet fibers, and are bent at an angle to enable advantageous position relative to the floor. The accessory is of uncomplicated construction, having a stem which telescopes into the rear shaft of the power stretcher. A pin holder bolted to the stem, is constrained against rotation relative to the stem, and has a plurality of holes for receiving pins. The pins are retained by setscrews. The accessory replaces braces formerly employed which bear against a wall for support.