fox 36 damper oil replacement

[brankulo]

going to do my damper oil change for the first time. i have 36 talas 160 rlc fit. i have studied instruction from fox service site. they want me to separate lower and upper (bladder) portions of cartridge, fill them separately with oil and than quickly put them together trying not to loose any oil as they are both topped. is this necessary? cant i just fill oil by removing lockout assembly? it just seems awkward connecting two tubes filled with oil without actually spilling some. am i missing something here?
thanks

[brankulo]

here is a follow-p for those interested. i managed to replace damper fluid without actually opening the cart.
used info found in these two threads.
changing oil in Fox FIT damper without opening cart? - Mtbr Forums

Fox Fit Damper / Poor Performance