Lacking that, bore a smaller hole and enlarge it with a round file.
They are slightly enlarged, if necessary, by the round file.
With a round file make semicircles at c and e to hold the rollers on which the engine is moved into position.
Holes can be made in the centre with a bradawl and enlarged with a round file.
A round file should always be a little smaller at its greatest diameter than the hole in the work.
This hollow can be quite easily filed out with a round file.
In the round file, the section is a circle, and the file generally conical.
A hole is drilled through the wheel and enlarged by a round file to ¼ inch in diameter.
I had at one time shown him how to bore a hole in a glass plate in five or ten minutes by using a round file wet with water.
For very accurate work it is sometimes desirable to grind on a round file, a flat place forming a safe edge.