Susanmarie,
We've discussed the Tri-Flow grease and the fact it's not to be used in motors (Singer or otherwise) many times.
What makes it great for gears, is what makes it unsuitable for motors.
I'm glad to see you've used Nova Montgomery's grease. I've got to try some soon. I've got many Singers and a couple of others that use that type of grease in the motors.
Joe