Rolex 3235; Watchmaker Question

Ok Rolex watchmaker aficionados - I'm curious about what appears to be a regulator on the balance bridge (see circled photo below) of the calibre 3235.


As a free sprung balance, being a regulator doesn't make sense - at least to me.

Then I thought, maybe its for making micro adjustments to the beat error? While I've always found adjusting the stud on a Rolex movement to be easy and well-design - perhaps Rolex wanted to get watchmaker screwdrivers away from the stud connection for making beat error adjustments.

While considering the regulator and spring stud adjustment I briefly considered this is a mechanism for the regulating nut that controls the balance bridge height. But that was a fleeting consideration - it's one sided and doesn't make intuitive sense to adjust the height from here.

I land on a micro-adjustment mechanism for the spring stud (beat error). But can anyone confirm or deny non-scientific, uneducated guess?

@Canuck Here are a couple more pics to help explain the movement. I don't have one on hand so I must rely on web images.

The 3135 has two regulating nuts, one on either side of the balance bridge. It allows for end shake adjustment on both sides. It seems strange that this new movement would only have end shake adjustment on one side of a bridge.

I think that you're right. The only reason I thought it odd to use one on a bridge is the bridge will rise and lower asymmetrically. As in, one side will go up and down while the other is in a fixed position. I would've assumed a parallel vertical movement would be preferred.