A method of assembling at least a part of a wind turbine blade by joining a first element of the wind turbine blade with a second element of the wind turbine blade , the first element comprising a first aerodynamic shell having an inner circumference, and the second element comprising a second aerodynamic shell having an outer circumference, the first aerodynamic shell and the second aerodynamic shell comprising a resin infused fibre material, the method comprising the steps of: a) manufacturing the first element , the first element having the first aerodynamic shell tapered in thickness around the inner circumference of the first element towards a first end , defining a first tapered section , b) manufacturing the second element , the second element having the second aerodynamic shell tapered in thickness around the outer circumference of the second section towards a second end , defining a second tapered section , c) aligning the first element and the second element , the first end facing the second end , d) inserting the second tapered section at the second end into the first tapered section at the first end , and e) joining the first element and the second element with adhesive , wherein step a) of manufacturing the first element comprises at least one verification step of a desired geometry of the first tapered section by measuring against a master tool reflecting the desired geometry of the first tapered section and wherein step b) of manufacturing the second element comprises at least one verification step of a desired geometry of the second tapered section by measuring against a master tool reflecting the desired geometry of the second tapered section. the first element comprising a first aerodynamic shell having an inner circumference, and the second element comprising a second aerodynamic shell having an outer circumference, the first aerodynamic shell and the second aerodynamic shell comprising a resin infused fibre material, the method comprising the steps of: a) manufacturing the first element , the first element having the first aerodynamic shell tapered in thickness around the inner circumference of the first element towards a first end , defining a first tapered section , b) manufacturing the second element , the second element having the second aerodynamic shell tapered in thickness around the outer circumference of the second section towards a second end , defining a second tapered section , c) aligning the first element and the second element , the first end facing the second end , d) inserting the second tapered section at the second end into the first tapered section at the first end , and e) joining the first element and the second element with adhesive , a) manufacturing the first element , the first element having the first aerodynamic shell tapered in thickness around the inner circumference of the first element towards a first end , defining a first tapered section , b) manufacturing the second element , the second element having the second aerodynamic shell tapered in thickness around the outer circumference of the second section towards a second end , defining a second tapered section , c) aligning the first element and the second element , the first end facing the second end , d) inserting the second tapered section at the second end into the first tapered section at the first end , and e) joining the first element and the second element with adhesive , wherein step a) of manufacturing the first element comprises at least one verification step of a desired geometry of the first tapered section by measuring against a master tool reflecting the desired geometry of the first tapered section and wherein step b) of manufacturing the second element comprises at least one verification step of a desired geometry of the second tapered section by measuring against a master tool reflecting the desired geometry of the second tapered section. <EOS>