It seems not the MS but rather the teleflex or whatever levers you use:
- disconnect the cables
, move ms into neutral, shift forward / reverse by hand,
this is how you will now if the transmission
Undo the levers, clean and grease and work
them without the cables
- do they shift smooth?
Re-fit the levers (with the cables attached to the MS in their half-thread pos when the ms is in neutral. Now reconnect the cables at the levers.
If all is fine, no free play, etc. Then you are home.