Hi eliass,
I am not a strong boy, so last time I used cheap turnbuckles to do the bending for me.
I drilled out the middle, put copper wires inside, then bounded copper wires on the outsides.
Then used the turnbuckles to pull the trunk into position, and hold it there using guy wires.
I bent it down, so turnbuckles are appropriate, any other directions, then I guess we need more support.
This was what I did -- it is not healing too well. As it as pulled down, the two halves of the trunk were pushed further away. But this does not seem to affect the health of the tree. It is very healthy at the moment.
*
* *
Please post the results.