Howdy Rob.
I sort of had a feeling we'd come across this before we tried the MK1 version, but it was worth a go. We found that we got the 3/4 UNF nut pretty tight, but it needed another 1/8 turn, and as soon as we did that the whole lot just started turning on the nut. I even optimistically popped some fuel in to test, but sure enough it leaked.
Unfazed, he took it back with him, to have a think and later messaged me asking if I'd got a pair of circlip pliers. Mk2 (drilled) allowed us to grip the insert whilst tightening the nut against it.
Hope that makes sense??
