A crimping assembly for securing a cover part to a structural member, the crimping assembly comprising: a housing; a drive shaft disposed within the housing and rotatable in a first direction; a first roller fixedly secured to the drive shaft and rotatable therewith; a slide shaft disposed within the housing and rotatable in a second direction; a second roller fixedly secured to the slide shaft and rotatable therewith; a drive mechanism operably coupled to the drive and slide shafts (60, 72) for rotation of the first and second rollers (64, 74)to secure the cover part to the structural member; including a drive gear operably coupled to the drive mechanism and fixedly secured to the drive shaft for rotation therewith in the first direction; a coupling mechanism operably connected between the drive shaft and the slide shaft to allow movement of the slide shaft relative to the drive shaft for movement of the second roller towards and away from the first roller in order to accommodate variations in structural member thickness; and wherein the coupling mechanism includes a driven gear engageable with the drive gear and operably coupled to the slide shaft, an output rotary gear fixedly secured to the slide shaft and operably coupled to the driven gear, an intermediate rotary gear operably +coupled between the driven gear and the output rotary gear, and a first set of link members each having one end rotatably coupled to the driven gear and an opposing end rotatably coupled to the intermediate rotary gear to rotate the intermediate rotary gear in response to rotation of the driven gear, the coupling mechanism further including a second set of link members each having one end rotatably coupled to the intermediate rotary gear and an opposing end rotatably coupled to the output rotary gear to rotate the output rotary gear in response to rotation of the intermediate rotary gear. a housing; a drive shaft disposed within the housing and rotatable in a first direction; a first roller fixedly secured to the drive shaft and rotatable therewith; a slide shaft disposed within the housing and rotatable in a second direction; a second roller fixedly secured to the slide shaft and rotatable therewith; a drive mechanism operably coupled to the drive and slide shafts (60, 72) for rotation of the first and second rollers (64, 74)to secure the cover part to the structural member; including a drive gear operably coupled to the drive mechanism and fixedly secured to the drive shaft for rotation therewith in the first direction; a coupling mechanism operably connected between the drive shaft and the slide shaft to allow movement of the slide shaft relative to the drive shaft for movement of the second roller towards and away from the first roller in order to accommodate variations in structural member thickness; and wherein the coupling mechanism includes a driven gear engageable with the drive gear and operably coupled to the slide shaft, an output rotary gear fixedly secured to the slide shaft and operably coupled to the driven gear, an intermediate rotary gear operably +coupled between the driven gear and the output rotary gear, and a first set of link members each having one end rotatably coupled to the driven gear and an opposing end rotatably coupled to the intermediate rotary gear to rotate the intermediate rotary gear in response to rotation of the driven gear, the coupling mechanism further including a second set of link members each having one end rotatably coupled to the intermediate rotary gear and an opposing end rotatably coupled to the output rotary gear to rotate the output rotary gear in response to rotation of the intermediate rotary gear.