So I just bought a Cinelli Alter stem (1" threadless, 26mm). So I slap it on my Bianchi Pista.. tighten up the top screw, then the sides. Put the wheel in between my legs and try to move the bars around. With a little bit of muscle, I'm able to move the bars from side-to-side. Not good.
I take the stem off, clean everything off with alcohol. Put it back on, tighten the top, then the sides again until my hand turns red and I can still move the bars. What could be the problem? Do I need some sort of shim or grip tape?