ST70 Exhaust Breather Route

Does anybody know the route that the exhaust breather pipe should follow on a 1973 ST70? There are seemingly no clips to hold it in place (unlike the battery breather) but I can't believe it should just flap in the wind. Ideally looking for a historic image or a bike that still has its original.

I am rather pedantic with things like this

Thanks.

hi , you are correct. it is tucked in behind brake switch.
i cannot get piccy file small enough