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thanks for the replies guys. I will try to take some pictures to explain better what I am talking about.
I had come across that website Bill - it is very helpful, and was the one I referred to most when going through this process. With the old style worm / motor / coupler arrangement it was quite easy to feel whether the meshing of the worm with the main gear was too tight or loose by using a notched piece of dowel to manually turn the worm and feel the effort required to turn it as well as the backlash. It was a nice, direct way of seeing what it was like. But with the new setup, you can't get anywhere near the worm once it is installed and the only way you have of gauging it is how much play you have left in the axis once its all done up.
Thanks again
Adam
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