RE: 109a fuel line to body install.
On my 109 I have a T fitting inside with the 3rd leg through a hole in the body with a bit of tube epoxied on the inside for support...there is a aluminum plug fitted in the tube outside the fuselage . I have a pair of hemostats with the end grips filed smooth and I just reach in a window and lightly pinch the line to the carb with them when I'm fueling or sitting with a tank full to avoid the annoying habit of spinning the clutch loose or bending a rod on startup flooded. Todd