Thanks Nikki6,
I still haven't really got round to repairing this one yet (wearing my Sinn 103 in the meantime) however took another look at it and kinda fixed it. Realized that the tube is in two parts, 3/4 the way up the tube is a groove, grabbing the top 1/4 i began to turn it anti-clockwise thus unscrewing it from the bottom part, great! Secondly i pulled on it, this stopped the watch, after much fiddling i realized i could not put the crown back on with the internal tube spring in place so i eventually gave up trying and tried screwing down the crown without the spring. Viola! the crown screws down!
I now have a watch i can wear, albeit without the full functionality of the chronograph, unfortunately when i push the buttons they act as if i am trying to reset them (like when they don't return to the normal positions after using the stopwatch). It will probably require a real watch repair man to really fix this now as the crown is now on and will no longer come off, i'm thinking the stem probably needs to be grabbed from inside the case to twist off the crown to fit the spring. For now i'll just wait till the battery needs to be changed and have it looked at then.
Thanks for your advice (and other members) it inspired me to tackle the problem again.
My humble collection: