Bosch 11222 739 EVS Hammer drill

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I have a Bosch 11222 EVS hammer drill and the end of the chuck came off when I was removing the bit, I cannot get the chuck assembly back on.   I can feel it aline with the slots but when I go to slide it on and pull back on the sleeve, it feals like the ball barrings are not relasing and allowing the chuck to slide on the shaft.   I've looked for video's and a couple show it just sliding back on but I have been unsuccessful in getting re-assembled.