Originally Posted by
MoAlpha
Bike must be on the ground, as you state. Even then, it seems to take a lot of force to get the play out of the stack, so I back off the cap after I nip up the stem.
My MTB fork has two star nuts in the steer tube from using this technique but going just a bit too far. Snapped the alloy top cap bolt inside the threads but didn't have anything long enough to push the old nut out through the bottom of the fork, nor any good way to get the broken bolt out.