How do I free myself?

Hint 1 of 8:

Do you remember something special about your left arm?

Hint 2 of 8:

It is a lady's arm.

Hint 3 of 8:

Since it's smaller than the other one, maybe you can slide it through the
cuff.

Hint 4 of 8:

The other arm is something else.

Hint 5 of 8:

Maybe some help from above will show up.

Hint 6 of 8:

Look at the grate at your left.

Hint 7 of 8:

Someone is dropping a key.