Bonding objects together

A method of mechanically connecting a connector to a first object, comprising the steps of:

• providing the first object, the first object having an opening;
• providing a first connector part, a second connector part, and thermoplastic material in a solid state;
• placing the first and second connector parts relative to the opening;
• causing energy to impinge on the thermoplastic material, until at least a flow portion thereof becomes flowable and flows relative to the first and second connector parts until it is in direct contact with both, the first connector part and the second connector part;
• causing the thermoplastic material to re-solidify;
• whereby the re-solidified thermoplastic material locks the first and second connector parts relative to one another to yield a connector assembly comprising the first connector part, the second connector part and the thermoplastic material;
• and
• whereby the connector assembly is anchored in the opening by the thermoplastic material or by the locking of the first and second connector parts or both;
• wherein one of the connector parts comprises a head portion, wherein the other one of the connector parts comprises a foot portion, and in the step of placing the first and second connector parts relative to the opening, the one connector part with the head portion is placed into the opening from a proximal side of the opening so that a portion of the one connector part reaches into the opening and the head portion remains proximally thereof, and the other one of the connector parts is placed into the opening from a distal side of the opening so that a portion of the other one of the connector parts reaches into the opening and the foot portion remains distally therefrom.