How to reattach mainspring to barrel arbor

[NovemberNeptune]

I am completely new to watch repair, but after a few days of research, I decided I wanted to repair a broken pocket watch that I had sitting around. After some careful disassembly I opened up the mainspring and soon noticed that the spring was detached from the barrel arbor. It seems that the hook attaching the spring to the barrel arbor has snapped off. I am wondering how it is recommended that I reattach the mainspring.

Thanks,

NovemberNeptune

[oldhippy]

Attach it by carefully bending the spring end to the barrel arbor. I say careful because it might snap and break off. I always used a pair of round nose pliers. 

[HectorLooi]

8 hours ago, NovemberNeptune said:

It seems that the hook attaching the spring to the barrel arbor has snapped off.

Could you remove the barrel arbor and take a photo of the hook?

[Nucejoe]

Bend the mainspring so it would wrap around the arbour tight,  arbour catch shouldn't get out of spring's eye if you turn the arbour in either direction clockwise or anticlock. 

 

[nickelsilver]

Your hook is fine, and I think it will catch and wind with the slightest bend right at the end. Once the second turn wraps around it holds it on the hook, so no need for extreme bending. It probably came unhooked when letting the power down, if it's done too fast sometimes it will unhook and even wrap backwards almost.