instrument panel assembly is mounted on a trolley 28 which has rollers 32 engaging the rail 24 the trolley is moved along the rail by any suitable means which may include the hook 30 referring to fig4 11 the trolley has vertical hangers 34 with the rollers 32 at the upper ends the fixture 26 extends between and is supported by and secured to the hangers 34 of the trolley the trolley with an instrument panel assembly on the fixture moves into the pick up station where rollers 35 on the bottoms of the hangers 34 enter the channel shaped roller guide 36 to stabilize the trolley and keep it from swinging during this movement of the trolley at the pick up station the swing frame assembly 18 takes the instrument panel assembly from the fixture on the trolley and later transfers it to a car body b the hangers of the trolley have parallel side panels 40 and 42 the fixture has parallel side panels 44 and 46 between the side panels 40 and 42 which are pivoted to the latter by aligned horizontal shafts 48 and 50 shaft 48 is secured to side panel 44 of the fixture and extends through a bushing in the side panel 40 of the trolley a wheel 43 on the outer end of shaft 48 is used to manually turn the fixture to facilitate assembling certain components on the instrument panel before the trolley reaches the pick up station a pin 49 slidable in side panel 40 of the trolley is urged by a spring 51 to a position in which it extends through a hole in the side panel 44 of the fixture to lock the fixture against rotation relative to the.