Welcome to the Quilting Board!
I have a 13 year old can of T-F spray - I should see if it is any good.
NEVER let a sewing machine know you are in a hurry.Success is not final. Failure is not fatal. It is the courage to continue that counts. Winston Churchill
The paperwork with my richmond indicates the same department store in New York. My machine belonged to my great grandmother, and later some great-aunts who lived in a small town in upstate New York near Cooperstown. After her last sister died, my grandmother went back to close out the family home, and the treadle was shipped to me in California when I was in my twenties. I have had it since the late 1980s, it works great, and as you can see it is in very good shape. I keep it cleaned and oiled since I did an original deep clean, and use it on occasion.
As far as age, my treadle base has a wooden footman, which others on this board say indicates the machine is pre-1900. That would make sense based on my family history timeline, and I would guess it entered the household sometime in the 1890s to early 1900s.
Enjoy your treadle---mine seems pretty indestructible, so if you've got yours up and running that's a good sign you can clean it up and use it for years. I'm constantly amazed to look at the old richmond and know that it is over 100 years old!
Regarding your bobbin winder arm, when you disassembled and reassembled for cleaning, it sounds like you didn't get the spring seated again correctly---it has to be under tension when you reassemble in order to work. I did the same on mine when I deep cleaned it, but kept at it and finally got it working again.
My DH just brought in a two cup spray bottle half full of 15 year old Tri-Flow. "Shake it up. I've never had any problems with it. Does what it's supposed to for me. Watch out because it spreads." Imagine my surprise! I have had it here all along. Boy howdy, do my treadles have a treat in store...
There is no fireside like your own fireside.