finally done it after hours.
it was that tight i couldnt, (and i even got a guy i know with hands of steel) get grip to turn it, just ripped skin,
thanks for telling my it was opposit thread, that helped, i knew i was turning it the right way.
ive just had the back part in warm/hot water for a bit, then screwed it to my marker,
then, (kinda clever) cut a stip off a beer mat, because there rubber it doesnt dammage the barral, and with mole grips i managed to finally get it free, wasnt very easy though :/
its done now anyway cheers for the help shaggy