a supporting rod holding arrangement for manufacturing a root section of a rotor blade of a wind turbine is provided . the supporting rod holding arrangement includes an assembly of a plurality of supporting rods , each having an interface section for connecting to a hub interface of the wind turbine in an essentially circular shape such that there are gaps between the supporting rods , a plurality of first fibers in the gaps which plurality of first fibers are physically and / or chemically compatible with an injection material , and a holding device which holds the supporting rods in the essentially circular shape .