Section 6 improvement to Draw Organiser

This is a fix to Section 6 (S6) in the Draw Organiser Model (https://www.crealitycloud.com/model-detail/662dbe058e22f8a77fd1db8f). The sockets were a couple of mm's off in the original drawing. This section fits perfectly to the existing S1 - S5 sections. Please use S6a instead of S6.