Custom thickener for rear spar channel M5 rivnuts

In line with my usual practise I have created a 1mm 6061-T6 doubler to provide more grip for the M5 rivnuts installed in the CF-CHL-002-C-A- Rear Spar Mounting Web- Support Channel, as the latter is rather too thin. The holes for the rivnuts were enlarged to 7.1mm with a reamer, as per the Gesipa specs. These rivnuts were set after being coated in JB-Weld, as usual