that precise manufacturing tolerances are not required between the interfitting parts and the striker puck retains more of the u201c feel u201d of a regulation hockey puck slider 25 is maintained in the position of fig1 between strikings by an extensible and retractable return spring member indicated at 32 the front end of spring member 32 is secured by any suitable means to any one of here five anchors 33 34 35 36 or 37 which project inwardly from the inside surface of left wall 13 see fig2 here conventional eye screws have been shown with one eye screw located in vertical relationship with each of indicia 10 20 30 40 and 50 the other end of spring member 32 passes around a rotatable pulley 40 see fig2 and 3 and its rear end is secured by any suitable means to an anchor 41 here a conventional shook see fig2 and 3 from fig4 particularly it will be noted that nut 30 maintains anchor 41 fixed with respect to slider 25 pulley 40 rotates preferably freely around mounting pin 42 which projects downwardly from an inverted generally u shaped mounting strap 43 the outwardly extending feet of the mounting strap are secured to a pair of mounting blocks 46 47 which extend between the inside surfaces of walls 13 and 14 obviously a single piece may take the place of the two mounting blocks 46 47 a pair of generally l shaped rails which are secured to the underside of top 11 are indicated generally at 49 50 see particularly fig4 the horizontal bar of each rail faces toward the center axis 51 see fig1 to form indented elongated slots 52 53 one on either side of the central axis and.