classic motorcycle forum

350mm would be the diameter of the exhaust pipe on the QE2!
From a (very distant) memory, the nut is 5/16" UNF.

If doesn't need to be MoT-able or even run to get a new V5C.
Earlier this year I applied for a V5C for my (very) non-running Guzzi. I had to supply a few pics to the Guzzi club who then provided the necessary dating certificate, then this plus a NOVA certificate (which I had to retrospectively apply for, but was issued with no problem) the V55/5 form, two forms of printed ID (bills etc) and the money were sent to the DVLA by a signed-for letter. Too much time and effort invested for the DVLA to then turn around and blame the Royal Mail when it gets lost in the DVLA's internal mayhem.
However, should you apply for the dating certificate from the all-powerful VMCC, expect more hoops and red-tape than the DVLA. Bloody expensive they are  too...

As I noted above, AF just means "across flats" and does not make any comment on the thread to be found on the fastener.

Leon

AF does indeed stand for "across flats" but you won't find that nomenclature on any Imperial spanners (often incorrectly termed "Whitworth") but you will find it on spanners intended for use on SAE threaded machinery.
This is obviously for the generally available tools and not specialised "ah yeah but in 1935 Spagthorpe made a tool kit for the Whippet...etc etc" stuff.

Don't know about Cubs, but on the twins the official parts books used to show the length of bolts and studs, so if it is the same in the Cub parts books then you could buy most of the fasteners from any supplier. Nookies Nuts is a good one.

If a supplier did stock every fastener as a kit I should imagine you'd probably whince at the price..

If it was an original old tank which has been refinished to that degree it would command a small fortune, but Indian-made tanks are cheaper, readily available and sometimes they even fit.
Usually you can tell the Ram-Jam items as they tend to be heavier and with poorly welded mounts etc plus a red lead finish inside.
As said, check it thoroughly before painting.

First read it and thought you said cruising to Sweden. They do some funny things there too..

Oh I dunno, there's some nice pictures of pies and accounts of life post-retirement going on at the moment.

Thinking back they're not a standard-size hex and are thin, so you really could use a mate with a lathe.
If a wheel never had them fitted and the spindle thread was flattened or damaged (as they often were given how many times the wheel had been in and out) wouldn't undoing the spindle nut cause the spindle to unwind from the opposing side cone?