I hit the very top rim of the hole just to knock off the sharpness. I have not had any chipping or cracking issues around the top of the slug since I started doing this.
--------------------
Doug Sterner
Doug's Pro Shop
Owego, NY
http://dougsproshop@aol.com
www.dougsproshop.net
Where Quality Service Outweighs Cheap Prices

i never bevel thumb for a slug

i do sand the inner hole a little to make slug go in better(if not you may crack ball), but i never sand within a 1/4 of top.

also
i do bevel finger holes slightly

I usually hit insert holes with the bevel sander for a second or two just to take off the sharp edge. and for thumbs slugs i do the same. But i always check the inside of the hole where the fillers are to make sure there isn't any hills or valleys. if there is anything sticking out i use a mandrel and just smooth it out so the slug can't get caught on any edges.
--------------------
Timothy @Juniors Pro-Shop
Staff Writer 7-10 Split Magazine,EGO Communications
Montreal, Quebec.

If it is a Brunswick ball, no.

If it is anything else, yes.

Viz A Balls and Poly I try to talk them out of using a slug all together. They will crack regardless of what you do!
--------------------
Nick Smith ... A.K.A. Les Badderâ„¢
Brunswick -=- PBA 03-06
http://www.BrunsNick.com
¡Viva la nación de Brunswick!