after which the pulley spring cartridge and housing 10 may be attached to the motor for starter operation it will be apparent that the spring cartridge may be removed and replaced at any time without difficulty or danger in a preferred form of the invention the cartridge has the single side wall 24 with the central opening 28 in it but it may have two side walls for certain installations and in either case the casing with the spring within it provides a stable assembly which fulfills all of the requirements of the invention it will be understood that in order to cause the spring to re wind the pull cord at least part of the backwound spring must be wound down onto the pulley hub 54 and that this is accomplished by engagement of the pulley hub abutment 58 with spring abutment 46 followed by further rotation of the pulley the spring abutment must of course be moved in the proper direction to wind the spring down and this requires that the spring cartridge be properly placed within the housing recess 14 in order to properly present the spring abutment to the hub abutment while this may be done by observation means are provided by the invention for facilitating this placement and this is done by differentiation of the two sides of the spring cartridge this is accomplished of course by the cartridge described above which has a closed and an open side wall another means comprises the provision of a spring cartridge having two side walls which are of different appearance as by making one side wall of the cartridge from opaque material and the other side wall.