Firsrtly you need to undo 5 screws, three on the bottom holding the PCB and two on the top of the stalk. (I did not have a stalk with cruise with me, but there are few more screws on top I think and you need to undo the cruise stalk part cover first in order to be able to remove lights stalk cover).
Once the PCB is removed take out the small rake like things that operate the lights so you don't loose them. Make note which direction they were mounted, it will ease the assembly process later on. If you take a look at the PCB you will get an idea how the stalk works basically.
then remove the plastic ring by loosening the brackets on top and bottom, pull it away through the stalk, then you will need to remove the top cover by undoing the clips on side it will pop off nicely.
next step is to remove the stalk itself. You do this by pulling it up (towards you if it was mounted in car direction).
Then you want to remove the little plastic thing that is the culprit here
you need two very thin screwdrivers or nails that can loosen two clips that hold it in place. once you insert those two screwdrivers in take a third one which will pry the little sucker up while pushing two small ones against the clip so that it becomes loose enough to pull the thingy out.
you will see that the F spec stalk has only one groove while older specs have two grooves which makes it possible to hold possition of the high beam. Photos are not very good but once you get there you will see it properly. The PCB part is the same on all of them, so once you swap these two arround you will have an F spec stalk that works as D spec.
when assembling the stalk, you need to put the two groove part in firstly, push it down until it clicks, then take the stalk itself and insert it into the casing. It is a little bit tricky so have a patience. The pointy thing at the end of the stalk is spring loaded and you need to push it against the grooved part in casing and then align the bottom pivot with the space on the stalk. It will all come together nicely. At the same time you need to put the little aluminium shaft in between the pointy end and bottom part of the stalk, so once you move the stalk it will operate the lights properly. Just note everything during disassembly and you will be fine. once the stalk is in place put on the top cover and screw it together, put on the plastic ring.
move to the bottom part and insert the small bits that operate the lights. they have a opening for a shaft on the backside. then put on the PCB on and screw it all together tightly and you are done.
seems difficult but be careful and you should be able to do it with little fiddling around fairly quickly and easily.
