Do the same for the cantilevers, noting that this time the hole must be drilled 290mm from the outer END of the section, including the M6 tube-insert. Recommend that you scribble down the one half of the tube so as to remember which end goes where, and at the same time it is a good idea to mark up the temporary rig with numbers 1 thru 4 to recall which cantilever appeared where on the outer frame.
