Drill three 3/16-inch
holes in the turnover for the holding-down screws. The two standards should
now be soldered temporarily together at the round ends and trued up to
match each other exactly. Place them in the vice with the bending lines
exactly level with the jaws, split the turnovers apart, and hammer them
over at right angles to the main parts. Whether this has been done
correctly may be tested by placing the standards on a flat surface. Take
the standards apart, and scratch a cross line on each 1-5/8 inch from the
lower surface of the foot on the side away from the foot. Make a punch mark
where the line crosses the vertical line previously drawn, and with this as
centre describe a circle of the diameter of the outside of the barrel. Cut
out the inside and file carefully up to the circle, stopping when the
barrel makes a tight fit. On the inside of the hole file a nick 1/8 inch
deep, as shown in Fig. 56. Remember that this nick must be on the left of
one standard and on the right of the other, so that they shall pair off
properly.
Standards and barrel must now be cleaned for soldering.
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