B* is the beveled
stop in the space, _k'_, as in the tool first described. The bed-dies
_h_ have a second set of notches C' D' at their outer ends, similar to
but longer than those C D, so that by reversing the bed-dies they will
form counterparts for a second set of punches corresponding thereto
for performing the third operation--_i.e._, enlarging the mortises, _c
d_, as represented in Figs. 3 and 3_a_; or, instead of adapting the
dies, _h_, to perform the two operations, separate tools may be used
for the second and third operations.
Fig. 4_a_ is an elevation and Fig. 4_b_ a sectional plan of the tool
for performing the fourth operation--namely, removing the portion
_a*_, Figs. 3, 3_a_, 4_a_, and 4_b_. This is done by a pair of
punches, A*, corresponding in shape to the ends of the link in the
rough and to the aperture shown in the bed-die, _k_, Fig. 4_b_, which
has a groove, _k'_, to admit the lower web of and to guide the rod.
The beveled stop, B*, used in operating on the pair of webs, a,
corresponds to the notches, _b'_; but in operating on the webs, _a'_,
the stop must be replaced by one corresponding to the aperture left by
the removal of the portion, _a*_.
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