Lesson 3
How Fixings Grip
Learn the three ways a fixing grips (pressing out, cutting a thread, spreading behind) and match the grip to what's behind the surface.
Builds on
Predict
You push a metal cavity fixing, a slotted metal sleeve with a flange at the front, into a hole in a plasterboard wall and tighten its screw. It goes stiff, and the flange pulls snug against the wall.
What has happened behind the board?
Choose a prediction, then select Next to see the answer.