First, the hairsping in the picture is unacceptably distorted, many topics on the subject of correcting an HS and the difficulty of the task - high. If you want to show how an HS looks like, remove cock, lay it down and shoot from above.
Then, fault finding consist of taking the entire mov't apart, clean it the best possible, inspect every part under magnification, pivots, jewel, gear teeth for damage. Put it back in the most basic form and test every function, end shake of every wheel etc. You can do that even without oiling because it will run anyway, not perfectly but it must not stop. Again, the forum has many many repetitive threads, which will tell you always the same things, just as any book would.
Hope you are all well.
I have a 6309a movement that came as part of a Seiko 5 'ebay special' I bought last year.
It would run for a few seconds and then stop again.
The hairspring had a bit of a kink in it which I very gently 'straightened' but the same problem occurred.
Strangely, the watch would run for a while but when I put the case back on and turned it face up, it would stop, every time.
Also, the oscillating weight feels very slack despite the screw being tight.
Any ideas of what it could be or advice on where to start with fault findings id be very grateful.
Thanks in advance.
Good question. I need reading glasses since I'm that age. I've not tried a lot of combinations but I've found that optivisor works well since you can wear glasses under them. I've mounted the extra magnification loup on my right eye when extra magnification is needed. If higher magnification still is needed, I use a standard Horotec loup in a head band without glasses.
The drawback is that the optivisor is somewhat bulky and sometimes tend to be in the way and you can "feel" that you wear it and after an hour or two you may need a break.