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 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 and ∘ the lever is or can be moved into a position, where the lever rests against a protrusion of the holding body at a point of contact, and when in contact with the protrusion the lever can be swiveled about the protrusion or the lever is connected to the holding body by a rotational joint, whereby the point of contact or 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 against the retraction direction leads to ∘ a swivel movement of the lever about the protrusion or 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 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 and ∘ the lever is or can be moved into a position, where the lever rests against a protrusion of the holding body at a point of contact, and when in contact with the protrusion the lever can be swiveled about the protrusion or the lever is connected to the holding body by a rotational joint, whereby the point of contact or 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 against the retraction direction leads to ∘ a swivel movement of the lever about the protrusion or in the rotational joint ∘ and a movement of the protrusion in the retraction direction. ∘ 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 and ∘ the lever is or can be moved into a position, where the lever rests against a protrusion of the holding body at a point of contact, and when in contact with the protrusion the lever can be swiveled about the protrusion or the lever is connected to the holding body by a rotational joint, whereby the point of contact or 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 against the retraction direction leads to ∘ a swivel movement of the lever about the protrusion or in the rotational joint ∘ and a movement of the protrusion in the retraction direction. ∘ a swivel movement of the lever about the protrusion or in the rotational joint ∘ and a movement of the protrusion in the retraction direction.