Assembly, comprising: - a first member and a second member, wherein; - the second member has a fork-shaped cross section with a main body arranged between two substantially parallel walls that each comprise at least one passage; - the first member is arranged between the two walls of the second member in abutting contact with a face of the main body of the second member, the first member comprising a passage; - said passage of the first member and the passages of the second member define a channel; - a connector that is axially insertable into said channel to an end position and consecutively expandable radially relative to said channel, to connect the first and second member (10, 11) relative to each other by pushing, in an expanded state of the connector, the first member in a radial direction relative to said channel against the face of the main body of the second member to define a clamping contact and thereby a pre-tensioned connection in said radial direction relative to said channel between the face of the main body of the second member and faces defined by the passages in the substantially parallel walls of the second member; - wherein said connector exhibits a length extending in a longitudinal direction of the channel and comprises: - a first expansion block that is configured to push the first member against the face of the main body of the second member; - a second expansion block that is configured to contact the faces defined by the passages in the substantially parallel walls of the second member; and - one or more than one wedge (22, 23) that is arranged in between the first expansion block and the second expansion block, and that is configured to be displaced longitudinally relative to the channel to thereby radially expand the connector relative to the channel, characterized in that, at a cross section halfway the length of the connector, a cross sectional area and a height of the first expansion block in the radial direction relative to said channel is smaller than a cross sectional area and a height of the second expansion block in said radial direction relative to said channel. - a first member and a second member, wherein; - the second member has a fork-shaped cross section with a main body arranged between two substantially parallel walls that each comprise at least one passage; - the first member is arranged between the two walls of the second member in abutting contact with a face of the main body of the second member, the first member comprising a passage; - said passage of the first member and the passages of the second member define a channel; - the second member has a fork-shaped cross section with a main body arranged between two substantially parallel walls that each comprise at least one passage; - the first member is arranged between the two walls of the second member in abutting contact with a face of the main body of the second member, the first member comprising a passage; - said passage of the first member and the passages of the second member define a channel; - a connector that is axially insertable into said channel to an end position and consecutively expandable radially relative to said channel, to connect the first and second member (10, 11) relative to each other by pushing, in an expanded state of the connector, the first member in a radial direction relative to said channel against the face of the main body of the second member to define a clamping contact and thereby a pre-tensioned connection in said radial direction relative to said channel between the face of the main body of the second member and faces defined by the passages in the substantially parallel walls of the second member; - wherein said connector exhibits a length extending in a longitudinal direction of the channel and comprises: - a first expansion block that is configured to push the first member against the face of the main body of the second member; - a second expansion block that is configured to contact the faces defined by the passages in the substantially parallel walls of the second member; and - one or more than one wedge (22, 23) that is arranged in between the first expansion block and the second expansion block, and that is configured to be displaced longitudinally relative to the channel to thereby radially expand the connector relative to the channel, characterized in that, at a cross section halfway the length of the connector, a cross sectional area and a height of the first expansion block in the radial direction relative to said channel is smaller than a cross sectional area and a height of the second expansion block in said radial direction relative to said channel. - a first expansion block that is configured to push the first member against the face of the main body of the second member; - a second expansion block that is configured to contact the faces defined by the passages in the substantially parallel walls of the second member; and - one or more than one wedge (22, 23) that is arranged in between the first expansion block and the second expansion block, and that is configured to be displaced longitudinally relative to the channel to thereby radially expand the connector relative to the channel,