Abstract: A laser device for teaching and improving the putting stroke of a golfer. The device includes a housing having a power source, an on/off switch a laser, a reflective surface rotatable by a handle and a lever system, a P.C. board and a switch to prevent the laser from being accidentally shone in the eyes of other persons. The device places a light dot on a golf ball or target area and indicates any undesirable body or head motion that will be noted by movement of the light dot by a golfer while standing over and stroking a putter with an aligned sweet spot. The device also allows a golfer to use a light dot to draw an imaginary line between a golf ball being struck and a cup to improve a golfer's visualization of the travel line of the ball after stroking it with the aligned putter sweet spot.

Abstract: A system and method for forming changes in elevation in a concrete slab includes one or more channels having substantially parallel bottom and top edges. The bottom and top edges include bent ends and a number of spaced apertures are formed in the bottom and top edges and the bent ends. Braces are inserted into the apertures to support the channel or channels in a vertical position. On or more different type bolt holders are selectively insertable into the channels for holding “J” bolts in a vertical position, parallel to the channels. Connecting elements are included for holding adjacent ends of separate channels together.