the source of the heat is an array of ribbon type electrical heating elements arranged in three zones 20a 20b and 20c each suitably supported in the opposite end wall brick work 12 on opposite sides of the circular path of travel of the pockets 19 each pocket 19 see fig7 and 8 is constructed of heat resistant metal and is formed with opposite side walls 21 spaced apart by transverse walls 22 for the reception of one or more components c at the loading zone when presented in a normal horizontal loading position at 180 u00b0 reversed from the position seen in fig8 where the under flat surface of the transverse walls 22 are uppermost what is seen in fig7 and 8 is the bottom surface of walls 22 which are formed with raised triangle surfaces or projections 23 which have inner margins that are angled toward the center slots 24 opening through the walls 22 of the pocket for the purpose of centering the component c to be carried in the pockets when resting on a pair of such margins each wall as seen in fig7 is formed with a slot 24 oriented to be on the radial center line of the wheel periphery so a stationary finger 41 is able to be located in line with radial center line of the wheel periphery for the purpose of allowing the pocket slots 24 passing the finger 41 which is adapted to lift whichever size of the component c is in the pocket over the projections 23 so the component can slide out of the pocket by gravity in order to load and unload each pocket so the component is oriented in the desired position for plug quenching the component c is inserted into the.