Service bonner catch.

[so called]

Hi all,
I have a problem in that the center bolt of my service bonner is broken.
The "shot bolt" is missing and so there is nothing securing the center of the bonnet down.
The end result is that one side of the bonnet comes free from its ball clip at around 110mph.
I am sure I could repair it but I dont know the original design.
Is the bolt screwed in ?

Alternatively does anyone know where I can get one or who was the original supplier to TVR.
I've asked at TVR Power etc with no luck.

Thanks,

[s6boy]

http://www.bellhillgarage.com/

Never had much luck with them myself but would think they're a good place to start.