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Okay. Cool.
I'm sure each of us has a different way of working this out but the eventual goal is the same... you need a chevron.
At CCW we use lasers, spirit levels, dummy axels and fineline/low-tack masking tapes to establish the position and then we sketch a silhouette onto some masking tape. We scan the rough tracing we have and make a digital version of the shape which we plot from masking vinyl so it can be re-made and repeated 'perfectly'.
Obviously that's a great deal of effort for what will for you, effectively be one masked edge but if any of that process is useful to you, it's yours.
Basically, you need to recreate a chevron shape in the correct place to achieve what you want. It should look lime some kind of 'V' shape from above in order to look like a straight line from the side. The dimensions of the chevron are specific to your bike and the angles/tubing profiles involved. You should be able to create a decent curve with some good quality tape and a heat gun (hairdryer is fine) or if you're happy with a sharp point, you can likely get away with two pieces of tape that overlap and then you can blade the tip into the shape that best suits your needs. Have a look at the images attached.
Hope all of that makes sense.
Show us some photos of how you get on?
Yes, that's what I meant - thanks. Like the grey/yellow one in the last pic only flipped 90°