Thats why I am glad I have a Mk III and do not require the third hand needed to operate that tool on the drum of a Mk I ~II as PL has alluded in the past, sometimes I think the weapons development sections like to build in frustration factors or decide to over complicate things just to make the grunts life or the amourers life just that much more miserable trying to figure out any easier way to accomplish adjustments of any type be it sights or o/hauling......
Or as was mentioned before in the past by some here, "Crunchies"have a knack of knakering the un-knakerable (New word)