All you really have to do is unscew the 510,pull it off and change out the stem. Then put back together,this is the short version of doing it.
You could also just purchase the V3 with the MAP code at FT for $59.00,or
buy the parts separately with shipping and do it.
this is the whole assembly that i changed.. if you look on the link you will see.. it was easier to do that than try and undo that dam thick tube..as the wires are all abit precarious...lol... just took out my v1 plastic inside and stuck in the v3 version...
step 1- undo the 510 connector
step2- undo the 4 torx screws inside the unit
step 3-carefully pull out the whole tray being carefull with the dna screen...
step 4- remove the horrible tint on the screen stuck inside the aluminium housing and micro mesh it carefully to make it nice and clear..
step 5- undo the screws holding the dna board to the housing..
step 6- slide out the negative connection which is held in place by a plkastic thingy in agroove..
step 7- undo the screw that holds in the positive connection spring...
step 8- remove from housing...
and then reverse the process to fit the new housing...
also i double sided taped the screen plastic thing that i micro meshed...
when refitting the unit into the aluminium housing make sure the dna screen is sitting right ...it sort of clicks/stays in place when you have it right you will know....
phew..!!!!