The DCD950 was DeWalt's worst chuck design. This chuck has no chuck screw, they loaded the spindle with locktite and put them on. Consequently, the chucks are nearly impossible to remove. DeWalt made a tool for this purpose, but it costs almost $90 - the only alternative was to replace the gearcase assy but they just made it obsolete, no longer available.
There is a conversion kit but the problem remains, you still need to be able to remove the old chuck.
We have used a metal cutting saw to cut the chuck off - about the only thing that works
Conversion Kit N422782 for DeWALT Power Tool eReplacement Parts
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