SINGER 95-100 - Manual (Page 21)

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To Remove and Replace the Sewing Hook
Remove the needle, slide plate and bobbin case. Take out the
screw (G,Fig.22) and remove the bobbin case holder position
Fig.23. Showing Correct Position of Thread Guard (U) and
Bobbin Case Holder (P) for Removal of Sewing Hook
bracket (H,Fig.22). Loosen the three set screws (L,Fig.22) in
the hub of the hook, then turn the balance vdieel over toward you
until the feed bar (S,Fig. 23) is raised to its highest point.
Turn the sewing hook until the thread guard (U,Fig.23) is at the
bottom, as shown in Fig.23, and turn the bobbin case holder (P,
Fig.23) until it is in the position shown in Fig.23. The sewing
hook can then be removed from the hook shaft.
When placing a new sewing hook on the shaft, have the thread
guard (U) of the hook at the bottom and the bobbin case holder
(P) turned to the position shown in Fig.23, so that the hook will
clear the feed bar (S).
When the hook is in position on the shaft, turn the bobbin
case holder (P,Fig.23) until the notch (T,Fig.23) is at the top,
then replace the bobbin case holder position bracket (H,Fig.22)
being careful to see that the position stud (M,Fig.22) enters the
notch at the top of the bobbin case holder, as shown in Fig.22,