fig1 6 8 10 12 and others where the bridge 38 preferably extends rearwardly and radially outwardly from a base 40 a of a tooth 40 toward the crest 39 a of a partial tooth 39 in addition and preferably the bridge includes at least two distinct inclined surfaces 38 a 38 b and 38 c the bridge may have further segments defining its outer surface the outwardly facing surface then of bridge 38 may be formed of several inclined surfaces as shown herein or in a single inclined or curved surface as it extends from base 40 a of tooth 40 outwardly to crest 39 a of tooth 39 these bridge surfaces provide a gentle engagement of puck 10 with the rack 42 of section 58 see below as the puck rotates moreover it will be appreciated that the slight taper or inclination 38 c extending from the crest 39 a initiates the puck turning slightly in the clockwise direction versus the counterclockwise direction to facilitate the puck alignment bridge 38 in desired alignment with the rack 42 this aids the proper alignment for pucks which may be almost properly aligned as they enter rack 42 but could be slightly over rotated by a very small amount thus consistent and accurate orientation is not impaired for pucks in near perfect original alignment as it initially approaches the rack 42 finally it will be appreciated that the configuration of the bridge surfaces requires the pucks to be run in only a downstream direction where the orientation rotation caused by rack 42 will only be in a counter clockwise direction as viewed from above with only a very slight.