Securing a second object to a first object

A method of anchoring a connector in a first object, wherein the first object is a lightweight building element having a first outer building layer and an interlining layer, the first outer building layer being thinner and more dense than the interlining layer, wherein the connector comprises thermoplastic material in a solid state, the method comprising the steps of:

• bringing a distally facing surface portion of the connector into contact with an attachment location of the first outer building layer;
• displacing a portion of the first outer building layer at the attachment location with respect to the interlining layer by applying a first pressing force to the first outer building layer and causing the first outer building layer to be pierced at the attachment location or in a vicinity thereof and causing the portion of the first outer building layer to be punched out by the effect of the first pressing force;
• applying a second pressing force to the connector and coupling energy into the connector, and thereby moving the connector into a distal direction relative to the first object until a flow portion of the thermoplastic material has liquefied and flowed to interpenetrate structures of the interlining layer;
• and
• stopping the energy transfer coupling and allowing the flow portion to re-solidify.