In a standard mortise lever lock, the Talon (the part that your key catches and pulls) is always set at the back/front of the lock depending on the side of the door your on, and thats where we have always applied the tension when picking.
PICKING
I concluded that a lock with the talon set in the center of the bolt would make things much harder when picking, as you would have levers on either side of the bolt. A six lever for example would be 3 levers, bolt, 3 levers.
Of course with a CB curtain pick this lock would still be pickable.
So now imagine two curtain wheels, one either side of the bolt. These curtain wheels are not the conventional type that throw the bolt but act solely as a shield. The curtain wheel your side could be manipulated to allow access to the front 3 levers but the back 3 would be shielded.
Any attempt to apply tension with a wire or non CB pick would obstruct the back levers too
DRILLING
Drilling to lever pick would be very tricky!
you would have to lift 3 lvers into position and then drill through the bolt to access the back levers
...
I managed to get some good 2d designs for this lock to scale but i could never achieve a 20mm bolt throw as you would need an exceptionally long, or fat bitted key. Conventionally it is done with the curtain wheels, but as they arent a part of the working mechanism in this design they cant be used.
iv given up for the minute il see if i can upload the working drawings
wow
