I have a K45ss mixer w/ a Hobart motor. I’m fixing it up,cleaned,painted, greased and new cord. It worked before I started but now it wont’t turn . I have 120v to the speed control ,I took out the brushes out when painting and covered the holes with a foam. The brushes don’t spark or meet the standards to replace (over a half inch long) and I have tried putting them in different positions to no avail. I can turn the mixer by hand also. Any ideas ?