Discovery 2 steering box adjuster

Hi guys....I have a slightly unusual problem with my steering box. It was a brand new Adwest box, fitted a couple of years back, and there's now a bit of play at the steering wheel which I need to adjust out.

Now normally you just undo the locknut on the adjuster a touch, stick an allen key or whatever in the top of the adjuster and wind it down as required, finally nipping the locknut tight....my problem is that there isn't a hole in the top of the adjuster, it's flush, so I can't adjust.

Now unless I'm missing something here (and I don't think so, done this a few times) I need an adjuster. They don't seem to be available as a spare, I mean who would need one, so has anyone got a scrap box I can have the adjuster from? Don't really want to use molegrips to move it, as there's no feel with that method

Hi, are you sure that the hole is not filled with muck and you dont see it? ... it's hard to belive that Adwest would do such mistake