Hi Al.. .Good to see you on the network.. .With regard to your article,as you so rightly say, it was bound to be controversial.. .My view is that you have spent an awful lot of time experimenting, making the mistakes and sorting them out successfully.. .Therefore I am quite prepared to listen very carefully to a different viewpoint, give it the benefit of the doubt and, as I teach most of my time, probably find a bit of height one day and try it for myself. . .Maybe you've got something. <img src="wink.gif" border="0"> <img src="wink.gif" border="0">