I have always used it to access the brake pipe nut on that side, very fiddly but possible with a cut down box spanner. On the rally car we used to screw a cover on to stop the crap getting in and I thought, why not do the other side too? After all it could be helpful when the wok is so close, and a similar cover would keep the muck out.
I have just successfully dummy fitted the nut through the hole so thought I'd share the idea, and it saves the usual bending back of the driver's side inner wing
![Wink ;-)](./images/smilies/icon_e_wink.gif)
In an improvement I have also fitted @Gordon Catmint's stainless steel nuts, which at 13/16th are a little bit smaller so easier to work with. I was considering the taller nuts on the passenger side but these work much better to my mind. If you are looking for them he describes them as being for the clutch pipe:
https://shop.catmint.biz/product/2k8686 ... ess-steel/
Happy New Year everyone
![Wink ;-)](./images/smilies/icon_e_wink.gif)