Showing the old quill stem I used to make my "HubBub" adapter to use the Sturmey-Archer SA-8 shifter on drop handlebars.

You will need:

• an old quill stem
• a hacksaw & file
• a tape measure
• a new bolt

measure the length of the shifter, then cut the quill stem such that you have about 1" of stem in addition to the wedge inside the handlebar when mounted. Well, 1" was a number taken from the top of my head, but it seemed a reasonable compromise and that's what I used. After all - there's not much load on this (only the twisting action when shifting) so it doesn't need to be super strong!

You'll need to visit your local hardware store and find a new bolt of suitable length. I don't recall what diameter & pitch the thread was, but it was certainly a standard size and I had no problems finding something suitable.

That's it, you're done! Well, almost... The S-A 8 shifter is designed to be wedged up against the handlebar grips, and so there's nothing to keep the black rubber grip onto the shifter. I superglued mine on - it's stayed on for a year now.

[UPDATE] I forgot completely - the quill stem is slightly smaller than the handlebar the shifter is designed to mount on. I made a shim by cutting strips of plastic bottle and wrapping around the stem. I've also heard aluminum drink can suggested, that sounds like it would work fine too.