Thanks Baldy ' remember when I gave you & Barry a demo all those years ago of this model :https://www.prospectingaustralia.com/forum/img/member-images/1194/1598156827_ffe26599348c4ec7bef5344585b18610.jpg
Thought it was the ants pants at the time
, had self adjusting dirt directors that allowed operation both ways from concentrating to clearing out the lights , they worked when the material changed direction thus the dirt pressure switched angle on discharge .
These were needed when reversing direction for the blades to take out the lighter material .
But That model although good at the time lost a small amount of gold when testing .
Cheers
Jack