Ahead to Quill Stem retro adapter

pip The short hassle free answer is: No, its not really possible due to the way the headset work.

Just an idea:

You could lock the headset into place with a seat post clamp (or at a push a jubilee clip) - just sit it at the very top of the stack (above your head tube) and clamp it around the protruding steerer - although setting the tension of the headset without the usual [star nut + cap + bolt] might be a little tricker but not impossible.

Here is something I knocked up in the very latest CAD modeling software running on the mainframe in my shed.

pip 1 1/8" quills are very rare (made mainly for the MTB market).

God did not rest on the 7th day as many of his flock believe, 'twas on this day that he brought the 'Shim forth from his bosom of creation.

I have made many a shim from layers of beer cans to fit various bike parts together, here are the rules:

Cheap beer (supermarket own brand) = thinner shims.

Posh stuff (Kronenberg/Stella) = thicker shims.

• just to make everything tight and solid between the quill and inside of the steerer - a thin layer of assembly paste (sometimes called friction paste) can really help.