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I've just got this switch assembly from an L-100 out of my loft. If you very gently press where my screwdriver is, that pushes the spring below the actuator inwards. That makes the part of the spring above the actuator move outwards. The normal range of movement is quite small, a millimetre or so. You only need to change the position of the spring by a fraction of that to make a difference.

Yes, the clear plastic part is what actuates the contacts, the springs (1) in your photo. The contacts open when the dimple in the spring moves into the cavity in the actuator. When the actuator is moved so that the dimple in the spring is on the land between cavities, this pushes the spring outwards to make contact with the fixed contact (3) in your photo. What I have found from experience is that if a switch doesn't make good contact after treatment with switch cleaner, pressing the narrow part of the contact spring slightly inwards with the tip of a small screwdriver causes the end of the spring to move outwards, making a better contact when switched on. A very small movement is usually sufficient.

The actual contact point can be seen in your first photo. On the end of the spring (1) you can just see the ends of a pair of (palladium?) contact wires just under the fixed contact (3). These contacts are actually very similar to the key contacts in the manuals of Hammond organs. Small pieces of semi-precious metal wire spot welded onto the contacts.