I just had the threads extended on my bike for $12. You can cut it to legnth yourself with a hacksaw, Just thread the locknut on the tube and use it as a guide to cut. Then, unthread th locknut completely, and it cleans up the threads you just cut.
Measure twice, cut once.
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Il faut de l'audace, encore de l'audace, toujours de l'audace
1980 3Rensho-- 1975 Raleigh Sprite 3spd
1990s Raleigh M20 MTB--2007 Windsor Hour (track)
1988 Ducati 750 F1