Hello welcome to the forums. I would not reassemble without them, there are in there for a reason. not having used this shifter I am not sure what you are talking about. can you post some pics? I don't think I ever heard of shifter that required it to be dissasmebled to install a cable.
__________________
“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk