Porter-Cable Model 548 - Manual (Page 10)

10
To unlock the lock button, squeeze trigger allowing lock button free to spring
out, and release.
BASE INSERT
Two base inserts, like the one shown in Fig. 3, are available to reduce
splintering the top fibers of plywood and other splinter-prone materials. One
insert has a short center slot for use with tapered tooth blades up to
1 /
4
"
wide. The other insert has a long center slot for use with tapered tooth
blades that are
3 /
8
" wide. DO NOT USE BASE INSERTS WITH ANY TYPE
BLADES OTHER THAN THOSE DESCRIBED. TO DO SO, MAY RESULT IN
BLADE BREAKAGE OR DAMAGE TO THE SAW.
To install insert, remove saw blade from Bayonet Saw and locate insert in
the throat of the saw base with the slot forward and the beveled side of the
slot up. Install appropriate blade as outlined in section INSTALLING THE
BLADE with the blade body in the slot of the insert.
When cutting plywood with the base insert installed in the saw, it is not
necessary for the good or finished side of the material to be down as would
be the practice with an ordinary jig saw. The small teeth of the blade and
speed of the saw in conjunction with the base insert will prevent splintering
or chipping of the top surface.
PLUNGE CUTTING
When cutting into a wall avoid contact with all exposed
metal on the tool to prevent electrical shock hazard resulting from
accidentally cutting into a live wire. HOLD SAW AS ILLUSTRATED IN
FIG. 4.
Fig. 2
A
B
Fig.` 3