Since my featherweight (and my other vintage machines) only have the single vertical spool pin I've discovered a couple of ways to stabilize the larger spools of thread.
The cones fit nicely on the smaller regular thread spools like you get in some sewing kits at the $ store. Or you can use one of the cardboard tubes from an empty large spool.
For the large spools with the cardboard tube center a small strip of craft foam rolled up leaving just enough room for the spool pin stabilizes it nicely and also allows it to feed freely.