Abstract: A wood-type golf club having an enlarged club head in the range of 250 to 300 cm..sup.3 constructed of a material lighter than steel to maintain the total club head weight within normal limits including the weight of a novel power shaft according to the present invention. The club head, without the power shaft, is approximately 175 gms. and the power shaft weighs approximately 25 gms., so the total club head weight is approximately 200 gms. and within normal limits. The power shaft, integral with the rear of the ball striking face wall at its forward end and integral or cast into the rear of the club head at its rear end, while reinforcing the ball striking face wall, increases the resonant frequency of the face wall to synchronize face wall rebound to the player's swing speed. Face wall resonant frequency is varied by changing the size and weight of the power shaft.

Abstract: A system for holding fast the zero end of a measuring tape to permit measurements to be read from the tape without compensation, including a generally triangular weighted body with three downwardly projecting pointed end legs, one of which holds the zero end loop or hook of a measuring tape, the legs being pointed to engage and hold on certain surfaces, and also being retractable to permit elastometric pads on the body to hold the body fast on damageable surfaces.

Abstract: A tamper resistant trigger blocking device for weapons having a trigger guard featuring a pair of blocking members that cover the opposite sides of the trigger guard preventing entry into the trigger area. The two blocking members are clamped together by a pair of oppositely disposed combination locks each of which has a plunger in the other blocking member that is grasped by the combination locks. Movement of the blocking members in the plane of the trigger guard is minimized by a plurality of indexible rods in one of the blocking members that are engageable with both sides of the trigger guard to prevent that movement. The user adjusts the positions of these rods to fit the user's trigger guard size and shape.