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WIN 1 of 2 copies of OGOF FFYNNON DDU in our latest caption competition!
Featuring 176 pages of lavish photography, a history of this classic Welsh system's exploration and first hand accounts of that dramatic rescue - from both sides of the stretcher!
I *think* it was M16, so 24mm head? Sorry, I should know, I did organise the replacement of it a few years ago but can't find any notes. A search of the forum here might bring up the exact size as it was discussed at the time.