Abstract: An arrangement in a structural element, for example in connection with a piece of furniture, in particular seating furniture or occasional furniture, comprising at least one first and second supporting member, each comprising a section with a cut-out. The cut-outs are adapted to allow the supporting members to be inserted retrievably into each other for mutual interconnecting. The first supporting member comprises a centre stem having a substantially continuous open slit extending therethrough, the centre stem including substantially bevelled or partially curved or wavy sliding/locking surfaces. The second supporting member comprising continuously adjustable supporting members with bevelled or partially curved or wavy sliding/locking surfaces complementary to the bevelled or partially curved or wavy sliding/locking surfaces of the divided centre stem.