SINGER W102 - Manual (Page 21)

CLEANING THE SHUTTLE MECHANISM
From time to time thread ends and lint may accumulate in the shuttle
mechanism. (This problem can be noted if the sewing machine
becomes noisy and is operadng under s.rain). The removal of lint
and thread ends does not require the services of a mechanic.
It can be quickly, simply and easily done as follows;
1. Remove bobbin case.
2. Push spring loaded knobs A away from the center.
3. Lift off hook or shuttle cover ring.
4
.
Remove the shuttle and clean it and the inside race carefully,
removing all dirt, lint and thread ends.
5. Replace the shuttle and shuttle cover ring in reverse order.
6. Push spring loaded knobs back into their holding position.
7. Replace bobbin case.
Fig. 19
18