This is a new pair of Thumb Nuts for the Olivetti Lettera 15 Typewriter.

Spool Nuts are easy to lose and hard to replace. On the Olivetti Lettera 15, they must be removed every time you change the ribbon. Over time, many have rolled off desks, never to be found again—leaving ribbon spools loose and unreliable.

These shouldered Thumb Nuts fit the original ribbon spools and match the spindle’s threading. They keep the spools steady, and ensure smooth ribbon feed and reversal. They’re brand new and polished to a shine.

Even if your machine still has the originals, it’s smart to carry spares—like keeping a spare tire in your trunk. Click Buy It Now and ensure your typewriter is always ready to go.