This question is really basic, and I would be embarrassed to ask it anywhere else, but here goes.
I'm making a jig, mostly out of 3/4 mdf. Two plates are held together by nuts and bolts. I want to bury the head of the bolt in the mdf so it will be flush, but as its mdf, I don't want to cut out more stock than necessary.
So stated in a general way, I need two holes, a 1/4 thru hole for the shank of the bolt and a 1/8th deep and 7/16 wide hole to bury the head, basically a small hole centered in a bigger shallower one.
I have some countersink/counterbore bits (never exactly the right size of course ) and a good selection of twist bits and forstner bits.
I tried a couple this morning, just eyeballing putting a 1/2 inch forstner over the 1/4 hole, and did a pretty awful job.
Tell me there's a silver bullet!!