i have a 10-l with a bison 3 jaw that i bought new. had it off maybe 10 times. usually with not much effort. not this time!!!!!!!!! what i thought would make it easy, is the use of a impact wrench that i borrowed from a friend. no go!! why the impact wrench dosen't work is that my compressor is probably too small. what i need to do is lock the spindle from moving slightly. how do i do that?? i won't engage any gears; because as tight as this is, i probably would lose some gear teeth. perhaps with the spindle locked; i can use a large breaker bar on the .875 hex stock that is in the chuck for use with the impact gun. can't believe that the chuck is this stuck. i have a small cheap strap wrench that helps a little; but spindle still slips. going to the hdw. store later to look for a heavy strap wrench. if they have none; will order online. oh, and before anyone asks, yes i am turning in the right direction (left).