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Disassembling Numbered Thread Tension Assembly
Turn the thumb nut (B, Fig. 1a) to the left until the numeral "0" on the
numbered dial stops opposite the center line between the plus and minus
signs. Press in the dial to disengage the pin (C) in the thumb nut from the dial,
and remove the thumb nut and dial, stop washer (E), tension spring (F),
indicator (G), the two tension discs (L), and the thread take-up spring (N).
Reassembling Numbered Needle Thread Tension Assembly
First, make sure that the tension spring (J, Fig. 1b) is in place in the stud
(O), then place the thread take-up spring on the stud, having the tail (inside
the coil) of this spring in one of the grooves (T) of the stud, and with the large
loop (N) of the spring resting against the upper end of the recess at (M, Fig 1a).
Fig. 1a shows the spring in the correct position on the stud. The tail of the
spring is not visible in these illustrations, but its location inside the spring coil
is indicated in Fig. 1a by (K).
Place the two tension discs (L, Fig.1c) with their flat thread-bearing sides
together in position on the stud (O) and with the loop (N) of the thread take-up
spring straddling the discs (L) as shown in Fig.1c.
Fig 1a.
Fig. 1b
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