Speedo cable

Does anyone know the size of the bolt that retains the speedo cable at the gearbox end, there's a standard 6mm now  but it's very slack and I wondered as it threads into alloy should it have a coarse thread.
 

Is the rubber seal/gasket fitted, that may take up some of the slack?

On my 83 gti it was M7. I struggled to get hold of one so ended up tapping it out to M8 (with the box in the car which was fun!)

I have got some M7 screws somewhere that I bought a while ago for something else,

I might give it a go with the 8mm tap if that doesn't work but at the moment it's holding with a coarse threaded bolt that is probably whitworth but is still leaking, it's surprising how much oil seeps out with just the car idling for a minute or two, it's amazing how much time you can spend on something like this.

Will have another look at it tomorrow, thanks for the relies

Quick google and found these threads on bolt size..

View topic: Where do you get this bolt - The Mk1 Golf Owners Club

View topic: bolt size for speedo cable bracket. - The Mk1 Golf Owners Club

Speedo cable bolt? What size? | VW Vortex - Volkswagen Forum

Thanks Mark, I don't know how you found that, I've tried a few times and that never came up.

The other problem with it was there was no 'o' ring on the tubular part that slots in to the gearbox, the only diagram I could find that showed one, you'll find one now, was in the old brown Haynes manual so I've put one there and it has now sealed, that is with my Whitworth bolt not forced or over tight.

So now it has an 'o' ring from an old Lister spares pack and a Whitworth bolt, 'Made in Germany refined in Britain'.

I'll source the 7mm x 1.25 bolts now and get it right.

Thanks for the replioes.