It would be easier if it had the removable hairspring stud to adjust for the height of hairspring. The hairspring and isochronism is not critical in an electric; however, the hairspring still has to be level and the coils not touching each other.
The balance assembly was taken from a donor movement, the regulator was bent down, making a difference in the dial up and down positions of 2 minutes a day. This was corrected and dial positons are within 5 seconds a day of each other, also the hairspring had to be leveled and tweeked.