Many thanks to all !!! I am in awe at the expertise brought into play on my behalf.

It's now 11:30pm here ( in the model aircraft design office ) and my brain hurts - so I will sleep on it and follow your suggestions tomorrow.

My normal method when faced with such problems, is to keep trying different approaches until something clicks - I don't have to work to any deadlines - but sometimes this leads to brain-fade.


Thanks again


John