It is inevitable that at some time access will be required to the inside of the wings so I decided to install an access panel in the underside of each wing just behind the strut attach bracket. In the left wing, this will also give access to the pitot connections.
I used the CNC router to cut out two 60mm radius disks out of 3/32" aluminium with six holes spaced radially on a 55mm circle. These will form the access panels. Then two rings were cut with matching holes and a centre 50mm radius hole and outside diameter of 140mm. Next a 120mm diameter hole was cut in the wingskin using a flycutter and a cutout for the pitot mount was also made. The mounting rings were then drilled for 6 platenuts which were flush riveted into place. The access panels were countersunk to take #8 screws. One ring was then bonded to the inside of the left wing and clamped into place for the epoxy to set.
It is inevitable that at some time access will be required to the inside of the wings so I decided to install an access panel in the underside of each wing just behind the strut attach bracket. In the left wing, this will also give access to the pitot connections. 
I used the CNC router to cut out two 60mm radius disks out of 3/32" aluminium with six holes spaced radially on a 55mm circle. These will form the access panels. Then two rings were cut with matching holes and a centre 50mm radius hole and outside diameter of 140mm. Next a 120mm diameter hole was cut in the wingskin using a flycutter and a cutout for the pitot mount was also made. The mounting rings were then drilled for 6 platenuts which were flush riveted into place. The access panels were countersunk to take #8 screws. One ring was then bonded to the inside of the left wing and clamped into place for the epoxy to set.
