Form wing overflow tubes

I was able to achieve an ok result with a 1" radius pipe bender, and was also able to exploit the fact that the holes were omitted from the custom fuel tank skin (by request) by moving the hole slightly rearward from the nominal (revised) position (but no to clash with the spar)

I note that my original fuel tank skins had the holes one full rivet pitch closer to the end than what I have seen other blogs. This would have necessitated smaller radius bends, requiring a more expensive tool. Maybe that is why Sling moved the holes in later revisions, and supplied longer pieces of tubing of about 22cm (which I was fortunate to receive). I note the directions in the plans are for the original hole position, the shorter tube, and are of no use in the present context.

I found that the flares provided in the supplied tubing were way out of spec (7.5mm diameter) and not so well formed. The specs for 1/4" tubing call for a flare diameter of around 8.9mm. I cut off the original flares (losing 3mm tube length) and reformed them. There was just enough tube length to achieve the desired result. I could have moved the skin hole a bit closer to the original position, thereby using less tube, but this would have necessitated tighter bends. I found a good compromise by trialling with flex.

I re-alodined, primed and spray painted the tube with the Stewarts system. The idea behind doing this is that when painting the aircraft I can shroud the grommet, and as there is no need to paint the tube at that stage so it is possible to preserve the unpainted appearance of the grommet, for what it's worth