From Changeringing Wiki
A bob is defined in a composition (implicitly or explicitly). There are default types of bob for most classes of method as defined below:
The default bob is:
- 4ths place for a seconds place method (pn14 in place of pn12)
- n-2 place for an nths place method where n is the stage, excepting group m methods, where a 4ths place bob is more commonly used to produce the repeating lead feature.
- 3rds place at the treble's handstroke lead in Grandsire.
- n-2 place at a six-end in Stedman.