Fig. 2143.
The following are examples of pening. [Fig. 2142] represents a shaft bent as shown, the arms being too wide at a, which may be corrected by pening at b. If the error was in the arms themselves and not in the stem, the side faces of the arms would require to be pened. Thus in [Fig. 2143] the distance a is too short, and the pening must be at b c.
Fig. 2144.
[Fig. 2144] represents a strap requiring to be closed across a, the pening being at c or d. But as pening at d would bend the crown and unpair the bed of the brasses, it is preferable to pene at c. In either case the jaws will close as denoted by the dotted lines.
Fig. 2145.