Special Cased Instruments, Continued
Needlepoints provide a stable pivot point for compasses and dividers to rotate
around while you use them. Needlepoints are either tapered, shouldered, or
a combination of the two.
Figure 2-35 shows the different combinations of needlepoints.
Protect needlepoints when they are not in use and sharpen them when
Figure 2-35. Needle
To sharpen needlepoints, follow this table:
Wet one edge of the oilstone and place the needle shoulder against
Twirl between thumb and forefinger.
Stroke back and forth on oilstone while twirling.
Figure 2-36 illustrates the shaping of a compass needle.
Figure 2-36. Shaping a
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