AkiraS said...
I have tried pulling it apart with a turn buckle, ............ hitting it with a rubber hammer but nothing.
can anyone give me any advise
Depending on how you attached that turnbuckle (

) and how / where it was hit with a mallet it may well now be buggered.
Carbon fibre laminates are brittle and do NOT like being smashed around.
Peoples - please read all the threads here before you treat it like a stuck steel pipe.
(EDIT - for the redthumbs brigade - I am not being critical of anyone in particular. Just that this topic comes around again and again and some methods mentioned will get the mast apart but possibly damage it in ways you cannot see. Read all the ways in all the threads and it will be apparent which ones work without beign brutal.)