What is this voodoo - weird middleburn lock ring

[ishaw]

All the middleburn cranks I've had, and I still have a few, have a lock ring which takes a tool that fits around the outside of the lock ring. A recent acquisition has a lock ring with Judy 2 pins to remove it.

I'm guessing this isn't standard, right?

I'm wondering how on earth I'm going to get this undone, assume a circlip ier won't have the strength in the pins for the usual force required to get the lock ring off?

 

[Frankenorange]

Adjustable pin wrench required, or a fixed wrench if the holes are at some kind of standard width.