Need a tool?

A bit shade tree as hobot would say but you could dremel off a small area around where the ring spanner needs to go. Id rather
just grind down the spanner. If it breaks, so what. Try again. I used a Snap on short ring type crow foot and had to grind it for
height.

RoadScholar said:

... If I purchase the Blue-Point 1/4W socket, ...

Click to expand...

We may be having a miscommunication, as the Blue Point wrenches I was recommending you consider are box end wrenches, not a socket.

No modification should be necessary, unless your barrel has some sort of anomaly. Actually, there are several manufacturers of 1/4 Whitworth wrenches that should fit with no modifications; Gedore would be another brand to look at. I think they actually make a wrench that they call a "thin wall" in their marketing literature. Here's an example of a Gedore wrench:


https://www.ebay.com/itm/Gedore-3-1...874821&hash=item4889fe799e:g:~g4AAOSwZd1VWvw~




.

I had the same problem, as I keep Italian bikes I have an extensive collection of metric spanners, found a twelve point 13 mm was perfect. Ok maybe it was 12mm, I can't remember, but is was around there.