come on OP, much easier ways of doing this...place about .25 lb of C4 directly on the bend appex. Now dont use any more than .25lb of C4, cuz its kinda dangerous stuff.
ok, ok, I digress, now place a kitchen serving plate ( wife wont care) over the C4 & strap it down with some duct tape real tight, if you dont have duct tape, any 'ol tape will do, but "duct tape" sounds alot cooler & manly, and stuff. Use all you can, its gotta be tight.
This all will form like a super duper metal bending shape charge.
Then light that sucker off, if you dont have the applicable charge igniter, just shoot at ita few times!!
Once it detonates, it will push that hardened, tripple chrome plated steel, reinforced bumper exactly right back where it belongs, easy peasy.
btw, post vid will ya, cuz I only "heard" that this will work, never actually seen it done.