Thanks all for your ideas and replies. Lez at Aardvark
has put a couple of pattern parts in the post in the hope they'll fit- and if Ian
-'Cestria' can find me one i'll be back on the shooting line quicksmart......
..even if i do have to shoot in green tights and post the pictures by way of a Thankyou !!!!
Otherwise- it's a pig of a job finding grubscrews, UK shops don't seem to carry them and it could be weeks before anything comes from european dealers(if) - my advice- don't lose them!