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One of my Peerless 8mm lathes came with the tailstock accepting 8mm collets for drilling. It's really great to have

So far I do not see anything that raises a red flag. J

It would be nice to have a better description than the picture. But the picture does give us the serial number and that comes back to a gold plated case With a 1458 movement. I looked up the movement number that is a woman's movement but we'll get to see the inside of the watch so we don't know what's really inside there or not.

Yes, pull it out from the inside. Nothing will get hurt, that's how it's done.

OK, understood. I mentioned that I bent this when I first installed the balance complete, and had to straighten and bend it back, so it's quite possible I've not gotten it adjusted correctly. OK, I've seen a couple videos of this being done, so I'll rewatch and see what I can do.

The hairspring needs to be adjusted at the stud, and then along the first coil past the regulator to be concentric with the balance center. It's way off, this is what's giving you your beat error change. You can probably see the spring body shifting as you move the regulator now. For the slow rate, check that the regulator pin is straight and close to the "boot", there should only be about 1 hairspring thickness of freedom (or less in many cases). To adjust the spring from the stud, it would be best to remove the hairspring from the balance, install it in the overturned cock, and adjust. When you are happy with the curve that the regulator follows, you will most certainly need to make a new adjustment at the end of the regulating curve to center the spring. The collet hole will be directly over the balance jewel when it's good. In the pic you can see a circle concentric with the balance center, and an approximation of the bends necessary at the stud, and where to make the additional centering bends at the red arrow.

Could it be that the ratchet wheel is slipping at the barrel arbor? Remove the ratchet wheel screw and see if the square hole or the square portion of the arbor is damaged.

Ooh... This just got interesting... Not that it wasn't already interesting, but that's another level of interest right there...

Looks to be an FHF 120, Generale Ressorts ref. 3473 1.35x 0.08x 240 7. Cousins has it GR3472.

if you have a tap and die set, (and a lathe) just thread a hole in a brass rod and you have the perfect "screw holder". doe's not work on left handed thread. vin

Hello. Watchcraft mainspring winders can be used to wind right hand and left hand so they are a good starter to begin with. Some mainsprings are left hand wind or right hand wind so the Watchcraft will work , but they are not the quality of a set of Bergeon winders which come in right and left hand wind sets or combined. I find the most K&D's winders are ok for pocket watches but not all of them fit most wristwatch barrels.