Stitches are not uniform
Needle incorrectly installed.
Install needle correctly.
Needle bent, or needle tip blunt.
Replace with new needle.
Thread tensions are not adjusted properly.
Adjust the thread tension.
1034D, 1034DX, 1134DW/ 1134D, 1634D, 1634DX, 3034D, 3234DT, 3534DT, 4234DT, 5234PRW, DZ1234, DZ1234, PS3734T, PS3734T, PS5234, PS5234, SB3734T, SB3734T, ST4031HD, ST4031HD, ST4031HDH, ST4031HDH
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