Sign IM Nail and Interlocking Screw System Technique Manual page 14

Nail Preparation
Assemble the Nail
Insert the locking bolt through the
hollow stem of the L-handle, figure 6.
Align the notches in the nail to the
corresponding protrusions on the stem
tube of the L-handle, figure 6. Be sure
the L-handle rests on the side for
proper interlock.
NOTE: Be sure the locking bolt rests as far down the stem tube as possible, figure 7.
Fig. 7
Attach target arm
Attach the assembled L-handle and nail to the
proximal target arm using the shoulder cap screw,
figure 8. Place the screw on the preferred side of the
L-handle for interlocking. Push the shoulder cap screw
in and carefully tighten by hand. Use the hex wrench
to secure the target arm to the L-handle. If the
shoulder cap screw does not turn easily, adjust the
junction between the L-handle and the target arm.
Attach distal target arm to proximal target arm
Place the alignment pin through the end hole in the distal target arm and distal slot in the nail, figure 9.
The distal cap screws are now
placed to connect the proximal and
distal target arms. Leave 2 holes
between the two distal cap screws
for stability. Withdraw the
alignment pin so only the tip is in
the slot to check alignment of the
target arm as the distal cap screws
are hand tightened. Use progressive
alternative tightening; tighten one
screw a little and then the other a little at a time, final tightening by hex wrench. Recheck alignment of
alignment pin to the slot.
Fig. 6
Tighten the bolt into the nail, figure 7. If the locking is
not progressing easily through the L-handle and into
the nail, unscrew the locking bolt and reorient the
locking bolt so that it enters the canal of the nail easily.
14
Fig. 8
Fig. 9