VAN's suggests using a mallet for this but I found that just clamping it into the vise and pulling back on the pieces was enough to provide the 6 degree bend, I used a carpenters miter to set and check the required bends. In the photo's below you can see that both HS-710 and Hs-714 came out the same. Of course before I made the bends, I back drilled the front spar.