WARNING that stem has a tail on the bottom to limit the height it can move . Excessive force can break it off .
It's been awhile , but I'll try .
You will need the proper lower and upper tools to properly remove it .
You first remove the cover nut inside the elevation knob using the hex end of the lower tool . The elevation knob may now come off , but you may have to flip the socket and remove the slotted inner nut first ( it's been awhile ) . You may have to use the upper tool in the slots to hold it tight . Once the inner nut is removed you unscrew the inner shafts using the upper tool . After that it's straight forward , just remember the order the shims