Ho - Frankly speaking, for old watch restoration, not many 'swiss repairer' can do the job.
So instead of rejecting you out right, they will excuse themself etc,...their charges are high, no spare pars, etc and so on.
A good restorer will willing accept your watch and patiently rework / modified where necessary but be prepared to pay more. But never ever send them back to Switzerland, they cost you a bomb.
my 2 cts
dc