It's a rubber... or an eraser as yuo may know it.
You push all the wires through the rubber, essentialy you now have a very McGuyver tubular pick. You can push each wire to a different depth, and because they are wedged tight they will stay in position.
All the posts regarding such a methord have been deleted in the past - it can be used on another kind of tubular lock, one that is deemed advanced.