Countersinking ferrules... what bit size to use?

[AprioriMark]

Never done this before... does anyone have any experience with this?

-Mark

 

[leo12.]

Is it going in a Warmoth body? 3/8" or 5/16" Ferrule? Here's some size info.
http://www.stewmac.com/shop/Hardware,_parts/Electric_guitar:_Ferrules/Guitar_String_Ferrules.html?actn=100101&xst=3&xsr=334

 

[ezas]

The Callaham site has some info on ferrule sizes

http://www.callahamguitars.com/partstel.htm

Part way down the page