A method for assembling a shell section of a wind turbine blade, the method comprising: • providing a support , the support comprising a surface having a primary surface portion configured for supporting a first component and a secondary surface portion configured for supporting a second component , • providing a first joining device configurable between a first configuration wherein an attachment part of the first joining device is extending from the primary surface portion and a second configuration wherein the attachment part is retracted and do not extend from the primary surface portion, • providing a first component comprising an inner surface , an outer surface , a first primary end and a first primary joint part along the first primary end, wherein the first primary joint part comprises a first primary joint surface facing opposite the inner surface of the first component , • providing a second component comprising an inner surface , an outer surface , a second end , a second joint part along the second end, wherein the second joint part comprises a second joint surface facing opposite the outer surface of the second component, • arranging the second component on the secondary surface portion such that the outer surface of the second component is facing the secondary surface portion , • arranging the first component on the primary surface portion such that the outer surface of the first component is facing the primary surface portion , and such that the first primary joint surface of the first component is facing the second joint surface of the second component , • attaching the attachment part to the outer surface of the first component , wherein the method comprises applying a force to the first component to force the outer surface of the first component towards the primary surface portion and the first primary joint surface towards the second joint surface , wherein applying the force to the first component comprises transitioning the first joining device from the first configuration towards the second configuration to apply the force to the first component . • providing a support , the support comprising a surface having a primary surface portion configured for supporting a first component and a secondary surface portion configured for supporting a second component , • providing a first joining device configurable between a first configuration wherein an attachment part of the first joining device is extending from the primary surface portion and a second configuration wherein the attachment part is retracted and do not extend from the primary surface portion, • providing a first component comprising an inner surface , an outer surface , a first primary end and a first primary joint part along the first primary end, • providing a second component comprising an inner surface , an outer surface , a second end , a second joint part along the second end, wherein the second joint part comprises a second joint surface facing opposite the outer surface of the second component, • arranging the second component on the secondary surface portion such that the outer surface of the second component is facing the secondary surface portion , • arranging the first component on the primary surface portion such that the outer surface of the first component is facing the primary surface portion , and such that the first primary joint surface of the first component is facing the second joint surface of the second component , • attaching the attachment part to the outer surface of the first component , wherein the method comprises applying a force to the first component to force the outer surface of the first component towards the primary surface portion and the first primary joint surface towards the second joint surface , wherein applying the force to the first component comprises transitioning the first joining device from the first configuration towards the second configuration to apply the force to the first component . <EOS>