Originally Posted by
NormanF
Keep your threaded quill stem. For ease of height adjustment, it can't be beat. If you need a taller stem, go with a Nitto Technomic.
About the only thing a threadless stem has going for it is you can more easily swap out bars but getting a height extension with them sucks.
Sometimes old really is better than new.
^This.
OP, why do you want to convert? Unless there's some strange situation, there's no advantage to going threadless- Quill stems rock! (Actually, they stay nice and tight...no rocking at all
! )