I don't know why everybody says to vee the crack. The depth of the vee
will be so much less than the frame thickness that it can't be
significant. And the braze will wick into the crack without needing a
funnel.

The link Ed posted in the "Joining Stainless Wire" thread about silver
brazing (http://www.aws.org/wj/amwelder/9-00/fundamentals.html) had a
chart showing joint strength versus joint width. The maximum was for a
joint .0015 thick!! That thickness joint had a much higher tensile
strength than the silver itself (3X). Joint strength fell off
dramatically with increasing thickness. Thus a vee will be much weaker
than a close joint.

Bob