elte spindle tool holder opening

Hi every one,
I have Axyz 4000 series table with elte 5 HP spindle
the problem is, the tool holder thread is broken
I want to take it to lathe but everyone need its holder to be opened from spindle
I donot have automatic tool changer and
also have that one holder only,
I just want to know is there any tool to open
that holder from spindle, I shall be thankful.