Rookie question - What does it means:"mold beagle"?

[hardwood34]

Read in this forum a few time - some guys to make mold larger doing "beagling" (sorry don't know this word)? What does it means and how to do that?
Thanks beforehand.

[JWFilips]

This may explain it
http://www.castpics.net/subsite2/MoldMods/BDE.pdf

[462]

And, it's a modification that's unmodificationable.

[dromia]

Search functions are your friend.

[hardwood34]

Thank you very much, guys!