Lock for holding a first part to a second part comprising • a holding body with a receptacle for receiving a protruding part of the second part, the holding body having a wall that borders the receptacle and • a locking element, the locking element having a protrusion, whereby ∘ the locking element has a first position, whereby in the first position the protrusion is in a locking position, whereby in the locking position the protrusion protrudes from the wall into the receptacle by a first amount and ∘ the locking element has a second position, whereby in the second position the protrusion is in a release position, whereby in the release position • the protrusion either protrudes from the wall into the receptacle by a second amount, whereby the second amount is smaller than the first amount, • or the protrusion does not protrude from the wall, • whereby the protrusion can be moved from the locking position to the release position in a rotational retraction direction relatively to the holding body, the lock further comprising a lever, whereby ∘ the lever has a first end and a second end that is arranged opposite the first end, whereby the protrusion is attached to the first end of the lever or forms part of the first end of the lever and ∘ the lever is connected to the holding body by a rotational joint or is connected to an attachment body by a rotational joint, whereby the attachment body is attached to the holding body, ∘ whereby the rotational joint is arranged between the first end and the second end of the lever and ∘ applying a force to the second end that is directed towards the receptacle leads to ∘ a swivel movement of the lever in the rotational joint ∘ and a movement of the protrusion in the retraction direction. • a holding body with a receptacle for receiving a protruding part of the second part, the holding body having a wall that borders the receptacle and • a locking element, the locking element having a protrusion, whereby ∘ the locking element has a first position, whereby in the first position the protrusion is in a locking position, whereby in the locking position the protrusion protrudes from the wall into the receptacle by a first amount and ∘ the locking element has a second position, whereby in the second position the protrusion is in a release position, whereby in the release position • the protrusion either protrudes from the wall into the receptacle by a second amount, whereby the second amount is smaller than the first amount, • or the protrusion does not protrude from the wall, ∘ the locking element has a first position, whereby in the first position the protrusion is in a locking position, whereby in the locking position the protrusion protrudes from the wall into the receptacle by a first amount and ∘ the locking element has a second position, whereby in the second position the protrusion is in a release position, whereby in the release position • the protrusion either protrudes from the wall into the receptacle by a second amount, whereby the second amount is smaller than the first amount, • or the protrusion does not protrude from the wall, • the protrusion either protrudes from the wall into the receptacle by a second amount, whereby the second amount is smaller than the first amount, • or the protrusion does not protrude from the wall, • whereby the protrusion can be moved from the locking position to the release position in a rotational retraction direction relatively to the holding body, ∘ the lever has a first end and a second end that is arranged opposite the first end, whereby the protrusion is attached to the first end of the lever or forms part of the first end of the lever and ∘ the lever is connected to the holding body by a rotational joint or is connected to an attachment body by a rotational joint, whereby the attachment body is attached to the holding body, ∘ whereby the rotational joint is arranged between the first end and the second end of the lever and ∘ applying a force to the second end that is directed towards the receptacle leads to ∘ a swivel movement of the lever in the rotational joint ∘ and a movement of the protrusion in the retraction direction. ∘ a swivel movement of the lever in the rotational joint ∘ and a movement of the protrusion in the retraction direction.