Regulating Tudor 79090

[iclick]

I have a newly acquired Tudor Sub 79090 that was running a bit slow (-5/day) and I thought I would open it up for a quick adjustment like I've successfully done with my Tudor chronos (791xx) for some time. I was expecting an easily accessible screw as seen in most photos of the ETA 2824-2 movement but instead found something different. Instead, the screw was mounted horizontally (red arrow in photo) and not-so-easily accessible as the lever mechanism of the chronos (Valjoux 7750). When I attempted to access the screw I was shocked when the assembly holding the screw (white arrow in photo) moved in a CW direction, the direction I was applying the small amount of pressure to the screw. When that happened my beat error increased, though I was able to barely nudge the screw in the positive direction as was the original intent.

After moving the assembly around I found a point that gave me a low beat error (≤0.2ms) in all positions. I assume that moving this assembly is the conventional way to adjust the beat error, but it would be nice to be able to regulate the timing (faster or slower) without moving the assembly. Is there a standard way to do this?

[iclick]

No watchmakers around to help?

Two more questions about this watch:

1. Is the lift angle 53° ? What value on the Timegrapher would be in error if I left it at 52°, the spec of all my other watches. It seems that amplitude is a bit higher at 53°.
2. Does the bezel pop off like the one on my GMT 1675?

[Vanessa CW21]

I wouldn't recommend doing this yourself, but if you insist, yes the screw needs to be turned in the direction of the + or -
With tweezers you can apply opposite pressure to the assembly so to not increase the beat error. Be really cautious to not slip and damage the hairspring...

The angle at 52 is fine.
The bezel assembly is the similar to the GMT. It'll come off the same way.

[iclick]

Thanks for the input, Vanessa. The watch is regulated close enough now (+1 sec. in three days), so further tampering isn't necessary at this time. If it does need it in the future I'll think twice about doing it again, as it indeed puts you perilously close to the hairspring. One slip....ouch.