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A toilet seat cover is a lever.
All toilet seats are the same basically. At the back, the hinge has a cap that lifts up and there is a bole head under it and a nut on the underneath side. Some have the bolt as part of the hinge with just the nut underneath.
Most toilet seats have a hinge that the top side that you see pops up or comes off completely. The bolt holding it on will have a large slot for a screwdriver in it. You should be able to get a wrench or socket on the nut underneath. If it is a metal bolt and rusted, you can probably use a hack saw blade between the hinge and the toilet and cut the bolt.
door hinges attached to door and hinge post
Hindge joint
A hinge joint is not immovable. A hinge joint has one plane of motion. A good illustration of a hinge joint is the knee joint.
The knee is an example of a hinge joint, not a ball-and-socket joint.
A hinge joint is not immovable. A hinge joint has one plane of motion. A good illustration of a hinge joint is the knee joint.
To replace the Ford Explorer rear window hinge, you have to buy a similar window hinge. Use a screwdriver to open the hinge and replace the hinge but fitting it in the window.
Synovial Hinge
A hinge joint. Ex: Elbow, knee.
In our joints our hinge joints are located between two bone our hinge joint is our elbow.