Trak Day Roll Bar

[BigCol]

I've got a used track day/FIA roll bar and the necessary thin-headed bolts from Carerham but one of the female threads won't bite, so I suspect I need to clean it out (and maybe tidy up one of the bolts too), so
a. anyone know the size of the thread?
b. anyone got a tap and die of the above size I could borrow?

[Aeroscreens]

On the old style (single diagonal strut) I'm petty sure it's 7/16"

[mic]

3/8th unf

[Gingerbread Man]

The FIA track day roll bar is often referred to the roll bar with the cross bar supports I believe.

[Aeroscreens]

My mistake, Mic's right with 3/8", for some reason I was thinking of the bolts for the cage bushes

[BigCol]

Thanks chaps... 3/8 UNF is what I've heard from elsewhere too (or from the same chaps under alternatively named logins! )

So, has anyone got a 3/8 UNF tap and die (and handles!) I could borrow very briefly please?