An Image Of A Properly Designed High Amp Alternator

The hole is not threaded. It exists to have the brush retention pin pass through the case when assembling the alternator.

Some wise rebuilder may have thought to improve the level of security of the SRE bearing -- but any modifications performed are not the product of Delco Remy.

Delco remedied the issue upon incorporation of "improvements" with the CS-130-D which has a completely different housing and components.