[r-t] Bobs only peal of Plain Bob Triples

[Philip Earis]

A frequent misconception in ringing theory is that you need singles to
ring a peal of plain bob triples.

Clearly this is not the case - see eg this 9 part by Prof Holroyd:

===
5040 Plain Bob Triples
Alexander E. Holroyd

W B I M  23456
--------------
- - -    63254
  - -    45362
  - - -  56342
  - -    24653
- -(-)   34256
--------------
9 part.  Omit (-) in parts 3,6 and 9 (3rd part end 234756)
===

My question though is: has a bobs-only extent of PB7 ever been rung?  I'm
probably unaware of multiple peals of something obvious, but even after a
quick search I'm not aware of any examples.