I have been donated a kids Ridgeback bike. The only part missing is the bolt to attach the rear mech.

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Untitled by danthomassw13, on Flickr[/img]

Can anybody tell me what it is I need to attach it?

Many thanks

I reckon this should do the job[/url]

It is from a much later mech than the one you have but it should fit

Exploded diagram RD-TX51

Thanks, Ill order one of those!!

I seem to remember from something a colleague said years ago that a chainset bolt might fit

Any 10mm nut and bolt and washer with the bolt head inside the drop-out will work.
If the head is too deep, file it down.
I have this on a retro frame where the thread is stripped, so got exactly the same mech as you show here and bolted it on 6 years ago.
Job done.

PaulD

I ordered Mr P’s recommendation above, If for some reason it doesn’t sort it, Pauls plan is next on the list!!

Thanks fellas