Tri-Flow grease is good for gears, however it is
not recommended for the grease wicks as it does not wick nor melt like the original Singer Motor Lubricant that was sold with these vintage machines. The formula has changed from what it was.
I'm sure that the grease that Nova and April sell should work if you want to go that route for the wicks. Fortunately, I have some of the vintage tubes for the wicks, but
I would not hesitate to use Petroleum Jelly.
I have been reading and researching about vintage and antique machines for several years and the consensus is that Petroleum Jelly is the modern day replacement for the vintage machines grease wicks lubricant.
A couple of web pages that I have found regarding this are
https://archaicarcane.com/love-becom...ewing-machine/ and
https://archaicarcane.com/greased-li...ube-in-canada/
I understand Lee's confusion. I am still not convinced one way or another about Tri-Flow grease - or for that matter - any grease for use on metal to non-metal gears.
Janey - Neat people never make the exciting discoveries I do.