As you progress in your mold making abilities, you'll notice that it's much easier to get the bolt hole and countersink perfect. A 3/4 inch drill bit for the countersink costs about $20, and leaves you with an angled bottom.

There is an easy way to avoid this. I use my table saw to make it, but you could also use a lathe, or even your drill press and some sand paper if you're imaginitive. I'll leave the method of how you get the dowel to these dimensions up to you.

Cut a length of the 3/4" dowel to about 5-7 inches. Trim about 2-4 inches of the dowel to just larger than 3/8" diameter. About 7/16 is just right. Now trim at the opposite end about 1-2 inches to 1/2" diameter. Now cut your dowel in 1/2 the long way starting at the end that was made to 7/16" all the way to about 1 inch from the place where the 1/2" radius was made.

Now you have a wooden 'drill bit' that will drill perfectly centered bolt and countersink holes to almost any depth you need!

See my countersink 'dowel bit' minus the part that drills the bolt hole. Photo 1. Photo2.

And, here is a drawing of what I am talking about. It works like an old 'spoon bit'.

  <- This is a front view of the 'bit'<- Side view.

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