Yamaha Crash Bars Hardware Question

[sethwaterfall]

I just picked up my Tenere and was checking stuff out. It came from the dealer with crash bars installed and I noticed that I can't get any of my sockets to fit on this bolt:

 

 

It is #12 in this photo I found while searching the forum.

 

 

I don't have the instructions. It seems like it should be 17mm but I can't get any of my 17s to bite on it. Do you need a thin-wall 18?

 

Thanks for any help.

[Rider 101]

From memory I had to thin down an 18mm. Lucky I have a lathe as buying one would take a week! The joys of living in the bush.

[Ol'crazy]

I use a flat screwdriver to hold the screw head while I tighten or loosen the nut, as you can see in this post: 

 

[Nige T]

Hi. I used a 17mm box spanner, fitted as the box spanner has thin walls.

Hope that helps