Base member and method for attaching an upwardly extending post to a surface and its use

A method for attaching an upwardly extending post to a surface comprising the steps of:

• providing a base member, wherein the base member comprises a bottom plate and a hollow connection profile for connecting the upwardly extending post to the base member, wherein the connection profile is firmly fixed to the bottom plate, wherein the connection profile extends in a direction transverse to the bottom plate;
• attaching the base member to the surface;
• sliding the upwardly extending post over the connection profile;
• and
• attaching the upwardly extending post to the connection profile by the use of a bolt, wherein the connection profile includes at least a first pair of cuts, wherein a cut forms a pliable lip, wherein the pliable lip extends in a direction transverse to the bottom plate, wherein a first cut of said first pair is comprised in a first side of the connection profile and a second cut of said first pair in a second side of the connection profile, opposite said first side, wherein both cuts of said first pair are at a same distance from the bottom plate, wherein both pliable lips formed by the cuts of said first pair are oriented in a same direction, wherein said bolt is placed in a threaded hole in the pliable lip formed by the first cut of said first pair, and wherein said bolt is tightened until the pliable lips formed by the first cut and the second cut are clamped against the upwardly extending post.