Andy, i'm not sure about a model 2120 at all but on our 55DA in the pic the rod on the right side is a brake rod going to the rear of the tractor. It has a pedastal so to speak that goes across under neath that both brake pedals and the clutch/inching pedal are housed on. I'm anxiously waiting for more responses from others on this "inching" and clutch issue......I can't believe this post has not gotten tons of responses.......I'm sure dumb-fudelled on this issue. If this is a inching pedal and this tractor doesn't have a real clutch then i've been driving it 6 months or so without knowing that. And even more disappointing is that no-one at my dealer seems to know that either. Where are all the pros at the dealers we rely on???? I'm going to have to experiment more with that shuttle shift.