Hey Mikey,

I got in late but it sounds like you are tring to strighten that boom? If so this is how I did it much like Dave said but with a little twist!

I got a piece of steel rod 1/8" under size of the boom. I slipped the boom over it and let it rest on two 2x4 blocks of wood. With the boom larger in diameter than the steel rod it will sag at the bootom so to speak. Then with a light (small) hammer I make ready. I turn the dented boom up around steel rod so the dent is facing up then I slowly start pounding the dent out. Remember the rod is on the blocks. the boom is in between. Now I forgot what heli your working on BUT if it is belt driven (happened to me) if the dent is to bad then it will NOT BE SMOOTH inside even after you are done. Once I got a burr inside and it wanted to eat my belt so do becareful. I have seen your dent and she is a good one but at least give this a try.

Good Luck
JPEE