Catalyst 180-R, Assembly Manual, Page: 8 / 74

Build preparation involves rounding off the corners of the large interior 'PDB hole' in the main frame plate. This is not absolutely necessary to fly your
Speed Addict 210-R or 180-R, but it is highly recommended and standard practice among top builders and racers. Catalyst Machineworks carbon
fiber plate parts are cut by state of the art CNC machines. Cutting the raw material could leave a sharp edge on parts and it is possible this sharp
edge could rub against wiring insulation, resulting in wiring shorts against the frame. Rounding the edges is quite easy to do, but does take some time
as the process must be done with caution. Take your time and do it right, scratches on the flat surface will show. Keep that carbon fiber looking
good!
To round the edge of the carbon fiber simply take a file or sanding block and hold the sanding edge at a 45º angle to the sharp edge. Work the
sanding surface along the edge of the part until the sharp edge is gone. You want a smooth, rounded edge along the entire interior perimeter of
the hole. Below is a picture of the PDB hole.