Specular decreasing image

[Alessio5C18]

Hello to all,
I'm trying to make the drawing you see in the picture but I can't find a way to make it "precise".

I should start from the hand-made drawing but I would like to make it precise and symmetrical.

I thought about creating guides on the sides and then circles to guide me in those points but it is not a good solution.

Can you help me?

Thanks,
Alessio

AI file: https://we.tl/t-Lm3TrDN0Oj

[Met1]

As sketched that's never going to be symmetrical, but try the Curvature drawing tool - it makes all the hard decisions about how much to drag the handles etc for you, but it still needs finessing, so watch a youtube vid first to get the idea of how to use it, and maybe practice first.

You could do one central path first then us offset path for a equal width "tube", or use the width tool if you want to alter thickness.

[Mike_Gondek]

https://watch.screencastify.com/v/tAM7lpwGShyngtQ2KQuc

Try drawing the shape by tracing over your image.

Simplify and smooth the path.

Move some points around.

Use the variable width tool