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If I remember correctly;

-Remove from boat. 
-insert into a vice
-cut the pole leaving 1-2 inch past the brackets
-cut the pipe vertically 2 x to make an X down to the bracket.
-remove hacksaw blade and thread though the pipe and reconnect the handle.
-cut the pipe as much as possible without cutting into the bracket.
-use a flat head screw driver and hammer it between the pole and the bracket on each side of the x. 
-spray Kroil or PBBlaster frequently. 
-if you get desperate use moderate heat and force.