Reply To: running fast

[arutha]

Probably an obvious one but is the hairspring touching itself anywhere? If coils are touching this can shorten the effective length and cause it to run faster? This can happen if the hairspring has been molested or oil has found its way on to it. Also if the watch has been apart and the hairspring pinned back in the wrong place again making it tighter?
Just a thought, sorry if Its not the answer.
Paul.