Professional Service Manual on CD for Singer 331K1 and 331K4 Sewing Machines.

Illustrated Parts Manual to Adjust and Service Singer Class 331k Sewing Machines

Factory Authorized Service Manual for Singer 347 and 348 Sewing Machines

Factory Authorized Service Manual for Singer Class 237 Sewing Machines

Factory Authorized Service Manual for Singer 337 and 338 Sewing Machines

Factory Authorized Service Manual for Singer 600 and 603 Sewing Machines

Factory Authorized Service Manual for Singer 611 and 631 Sewing Machines

Factory Authorized Service Manual for Singer 640 645 646 & 648 Sewing Machines