Re: setting timing on vintage obs with a timing light?
You would be surprised how far off you can be using feeler gauges. Unless you are spiderman. More important is getting them to fire exactly 180 degrees apart, which is easy with the fixture. Makes idle nice.
Just a note, do not loosen the mounting screw when adjusting the points, it only makes it harder. It is not necessary.
You probably know this, but just posting for others.