nothing serious, just a "WTF" when i took it out of the box. i heard metal parts rolling/sliding as i tilted the unit from front/back back/front. i took the cover off but nada, turns out it's a few punchouts in the protection bars. these are the punchouts which hold the press-in threaded ferrules so that the unit can be bolted to the bars.... a few small discs were having a ball inside, that is until i disposed of them :)