Here is an excerpt from a Waltham published manual covering adjustment of balance screws that Bob referred to and their effect, the entire document can be found here – http://www.walthamwatchinfo.com/Information/Waltham%20Watch%20Info.pdf
Here is an excerpt from a Waltham published manual covering adjustment of balance screws that Bob referred to and their effect, the entire document can be found here – http://www.walthamwatchinfo.com/Information/Waltham%20Watch%20Info.pdf