spacer element 22 may be removed to allow the lower portions 19 of trolley arms 18 to move or collapse together or toward one another to provide clearance for the lower portions 19 to be inserted into an opening not shown in center chain link 17 such as a central opening between the opposite side portions 17 a of the center link which may comprise a generally oval or ring shaped center link such as is known in the conveyor chain art the spacer or attachment element 22 may be inserted between the trolley arms 18 and may be secured between the lower portions of trolley arms 18 via one or more fasteners 30 which extend through apertures or openings in spacer element 22 and apertures or openings in arms 18 the spacer thus may space the arms apart a desired amount after lower portions 19 are received through chain link 17 in order to maintain the lower portions 19 of arms 18 in engagement with chain link 17 as shown in fig2 and 3 the lower portions 19 of arms 18 may include lateral projections or tabs 19 a for engaging the upper and or lower portions of the chain link 17 to retain the arms relative to chain link 17 when the spacer or attachment element 22 is positioned and secured between arms.