Bobbin winder on singer 1725

SOURCE: Problem with winding thread onto

first you must make sure the winder shaft is turning by moving it to the right a little and see if you can turn it by hand.
If it is turning ok then there is a rubber ring on the other end of the winder shaft and it should come in contact with the drive which turnes it ,if it is worn it might need a new rubber.

SOURCE: Singer 7444 trouble winding bobbin

It sounds like you don't have any tension on the thread when winding the bobbin. Make sure that you are running the thread through the tension disc on the top of the machine before going to the bobbin winder.

SOURCE: Bobbin is not winding correctly

slide plate may be worn - i had the same problem. try holding down the center of the bobbin with a pin while slide plate is in the winding position.

SOURCE: Singer 9410 bobbin problems

It should not affect the winding, the reason the needle is still going up and down is because the oil has gone dry on the shaft and unless you can get to the shaft where the balance wheel is then it would be wise to take the machine in for a service, loose stitching on the bottom is a tension problem, make sure the top tension is set about 4 or 5

SOURCE: I have a singer 503A. The bobbin winder will not

When you have the winder rubber on try and turn the winder by hand, if it does not move the chances are the winder has seized, if the winder wheel is moving but not the spindle then the grip (thread) has worn, if you cannot move the whole winder by hand and it has seized you need to get some WD40 and spray a few drops down the spindle, take an electric drill and put it over the top of the spindle and switch it on slowly and it will probably free it off, be aware of oil splashing out.
you mighjt get a digram from www.tandtrepair.com