Thanks for the replies , so looks like another piece of crap then, UN-servicable, wow.
And they are not cheap.
Its a pity some engineering company has,nt stepped up to the plate and designed replacement heads with full servicability for these machines and others .
I had thought of drilling a hole in the head and tapping a thread into it but where the bearings are is touch and go and the swarf going inside as well, however a thorough clean out with degreaser should clean it out , then ther,es the wall thickness for the thread , i guess there's not much there!
I have the old head and its shot so it might be worth a try on that.
Its not a cheap part and all thats gone are the gears , very annoying.