I hate to confess this, but having done a drastic clean-up on my dear old Singer 321-3 ribber, I now have 3 little "spare parts" left over.They are about 2x1/2 cm, each having a slit on one side ending in a round hole like a small screw hole. Two pieces are thin metal, the third is thicker.They slid out from near the clamp mechanism but I can't see anything on the other side to compare.(no spare screws)
Can anyone suggest a source for an old service manual or detailed illustration, please? It may be necessary to take the whole thing apart to find a clue but my helpful husband, who hasn't stopped laughing, says I might end up with more pieces left over. Any ideas very much appreciated!