Singer Centurion 121D - HOOK TIMING

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
HOOK TIMING
Proper clearance between needle and hook point, re-
quires that the point of the hook should pass the nee-
dle as closely as possible without striking or deflect-
ing it. There should be .003" - .005" clearance bet-
ween the two (Fig. A).
To
adjust clearance, loosen bushing set screw (Fig.
B).
With screwdriver placed as shown move entire
hook and bushing (Fig. C). Tighten bushing set
screw.
Hook Bushing
Set Screw
FIG. B
Insure that the needle guard prevents the
needle from
contacting the hook point at
any time. If large needles are to be used it
may be
necessary to string the needle
guard back to allow hook point closer to
needle (Fig. D).
7
FIG. C
Needle Guard
FIG. D
.003 - .005
Flat of
Hook Point
To Needle
FIG. A