where can I get the grafting drill bit that makes a hole the same shape and size as a pencil?

Jay, The one I looked at had a cylindrical tang much like the original "plugger" so the same diameter at the end of the cone 14mm. As you can see it does have a set screw to remove it from the handle.

Who knew? There are in fact at least two different pencil sharpener angles. I had no idea that harder pencil lead like something you would use for a drafting pencil has a sharper angle than a sharpener for a softer lead like a colored pencil. Be aware that my pencil sharpener matched the 14mm reamer but yours may not.

It does look like the original veritas tool is no longer made. I guess you could contact them directly and see if they have any old stock around.
I found this information sheet online which suggests that the taper is 16 degrees (so included angle would be 32 degrees). It suggests making a hole to depth with a 1/8th inch drill bit and the using the tool to taper it. Maybe that would help an engineering company find a substitute bit for you if neccessary.

Nancy Reading wrote:It does look like the original veritas tool is no longer made. I guess you could contact them directly and see if they have any old stock around.
I found this information sheet online which suggests that the taper is 16 degrees (so included angle would be 32 degrees). It suggests making a hole to depth with a 1/8th inch drill bit and the using the tool to taper it. Maybe that would help an engineering company find a substitute bit for you if neccessary.

That's a great find, between giving comprehensive instruction on the grafting method and confirming that the tapered bit is for reaming out a drilled hole. The package photo in an earlier post says the bit was made in France, so it wasn't among the products that Lee Valley's Veritas operation manufactured.
It might be worth contacting the Veritas people to find out if anyone there knows their source.

I'll second Nancy's advice to drill a pilot hole first and then use a tapered reamer to get the angle. Something to watch for will be the speed at which the shavings fall into the middle of the reamer, and to clean those out before continuing. Definitely the sort of thing to do by hand or at low speed if it's attached to a drill.

Here is the 0-14 mm reamer from Amazon compared to my pencil sharpened with my pencil sharpener. A match for taper and my sharpener taper. The reamer comes out of the handle and could be used in a drill.