oris cal. 231w

[markr]

I found this watch in an local online auction lot. As soon as I opened the back she sprang to life.  I put her on the timegrapher and she was running fast.  As I adjusted the arm she resisted and then broke free and went all the way to the - side.  As soon as I tried to go back the arm popped off. Does anyone know how I reattach it? 

[watchweasol]

Hi  short of taking off the balance cock removing the balance and spring  then dismantle the setting and re assemble, has the regulator damaged the balance spring ? as the spring runs through the index pins  but in any case it all has to come to bits, trying to press it back on will only lead to further damage.        cheers

[markr]

Thank you for your answer. So after it is all disassembled  I use a staking set and just press it back in?