Unmount the locking rings pins or ball of the toolholder while chisel is inside its possible make the parts short time hot with a burner not to long (where safety glasses ) and leather apron in case of splinters that can come off . spray some wd 40 on the hot part before use a bench vise to set the chisel in with machine on it and the beveled edge of the benchhammer on the front of the tool holder and with a second hammer beat the other site on the benchhammer to work slowly the machine will come off from the chisel. in most cases the drill guide has been worn out from the chuck in case off a cheap rotary hammer it make no sense to do it all. because it has had it working hours on it.
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Unmount the locking rings pins or ball of the toolholder while chisel is inside its possible make the parts short time hot with a burner not to long (where safety glasses ) and leather apron in case of splinters that can come off . spray some wd 40 on the hot part before use a bench vise to set the chisel in with machine on it and the beveled edge of the benchhammer on the front of the tool holder and with a second hammer beat the other site on the benchhammer to work slowly the machine will come off from the chisel. in most cases the drill guide has been worn out from the chuck in case off a cheap rotary hammer it make no sense to do it all. because it has had it working hours on it.