| Simon,
The tee nuts - 9/16" hex.  The turned down section is 3/8" diameter, 
3/8" tall.  1/4-28 internal threads.  5/8" overall length.
In the US, Moss Motors price is $3 each.
Cheers,
Bob Haskell
Austin Healey 3000 BN7/BT7 registrar
On 1/2/21 2:46 PM, simon.lachlan@alexarevel.plus.com wrote:
>
> First of all, thank you for the responses. All very helpful. Now I 
> know exactly where I should be. Should be!
>
> However, some ham-fisted cretin has been in there before me. I find 
> that the slides are held down to the floor by bolts whose shank size 
> is 3/8?. They?ve each had two of their flats ground down and they pass 
> through 3/8? holes in the bottom half of the slides and thence through 
> the floor to the outside.
>
> I think that it?ll be too much trouble to replace them but, just in 
> case, :-
>
> What is the outside diameter of the so-called tube nut or t-nuts which 
> should be coming up from below?
>
> And what size are the bolts which come down from the slides/runners, 
> through the floor and into the tube nuts? ¼? unf 28tpi at a wild 
> guess? Or bigger?
>
> See attached.
>
> And, finally, is there another name for these ?tube nuts? by which 
> they might be found and bought at a sensible price? From their prices 
> over here, they seem to be made of platinum.
>
> Thanks,
>
> Simon
>
>
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