Hello All this may be a daft question but on the top off the fork tubes just under the top yoke there is only what I can describe as a small groove looks like a Letter C or like a small thumb nail any 1 any idea why these are there? 1 each tube. ?

Based solely on your description, it sounds like the plug weld that secures the threaded insert. 

• ?I found out its just casting marks

Fork tubes aren't cast.  Perhaps a pic of what you are describing will help. 

Hi I spoke to a main dealer and he told me they was so don't know there off to have new chrome will post photo before and After.