Originally Posted by
CliffordK
Most people recommend building a clamp to hold the brake bridge while you're doing your adjustments.
I used a clamp on my first one. It fell off halfway through spreading it! Gave me quite a shock, but the frame held strong.
Since then, I think I've done 20 or so frames, none with clamps. There may be certain use-cases for a clamp, but I have never used one since my first.