Front Ashtray

[tc4332]

I'm lucky because it has never been used as an ashtray, just somewhere for SWMBO to keep her phone charger and leads.
Somebody mentioned a few days back how on nearly every bump in the road their ashtray would open. This made me realise that mine had developed the same problem over the last few weeks.
Whilst doing something else I had to take the ashtray out and inside the holder I found this.
20180220_114155.jpg

I think that it should be a complete circle. That is a full gear wheel.
I believe that it should sit on the white spigot and engage in the larger semi gear of the ashtray front cover.
20180220_114244.jpg

Could someone look in theirs for me and see if I am correct?
Next question, does anyone have a spare?