The shims in between are known as spacers - they don't affect picking much unless you damage one and it jams the mechanism up.
Have you read my guide on lever locks?
Here is a template of some lever picks:
Starting from top:
Lever lifter,
'J' wire/button hook/overlifter
Another tension wire,
Lever lifter.
The thing on the right is an overlifter, but it's a commercial bought one.
Give the 'j' wire a go. You'll find it works well.
Cheers.
