you can tension the curtain any way you like, its not going to slip out of place. I will have a look again tomorow. But if the middle lever is effectivly a ward, that doesnt move position when the curtain is turned. I cant see how you would pick the back few levers.
Because of the curtain its not like picking a double bitted lock without a curtain, (left right). The curtain on the non sprung levers makes you pick front, and back, of the curtain,and either side of the middle lever in the curtain slot.
If its like a ward and doesnt move when the curtain is turned. You would have to drop ( after a "T" bar type tension tool drops to the back for tension. Then 4 wires ( behind ward, front of ward. Front of curtain, back of curtain), and there is plenty room on this beast for 20SWG wires to work along side one another.
Thats is. If the thickness of a wire in the curtain, doesnt move the middle lever off gate when the curtain is turned.
Any ideas welcome, Ive just worked a 15 hour day, and had some home made cider now, so logic is fading for me
Watch this space