Macybaby, I had looked at the link I posted above, which shows plenty of room for a treadle, then was surprised that my treadle was a tight fit. I had the top and treadle turned upside down; the treadle started in okay, but then the heads of the bolts on the side hit the drawers. Arg! I was considering moving one set of drawers over a bit, but instead I just pulled the bottom of one of the drawers over slightly and "scooched" that side of the treadle a little then repeated on the other side. It scraped the inside of the drawers just slightly, but it's out of sight.
I eventually found a reference that said that this table started production around 1949. I don't know how long it was in production.
Tate