Can you cut down the height of a quill stem?

skoota maybe a vice and pipe cutter. jonny did some bars for me while i tried to hold them and it was still dead on.

Have you got a pipe cutter that will do a 45 degree angle? :)

To the OP - they can be cut down but you need to get the angle dead on. I'd try and work out what's causing the blockage first.