$0.50 feed lip tool:
Cut some round stock (or square, or hex...).
Slot it with a hacksaw or cutoff wheel. (Where ever and at whatever angle you want.)
Shape as desired, if the stock shape causes interference.
Mine are all out in the garage right now, and would get murdered by condensation if I brought them inside for a photo, so I went with a quick CAD rendering.
I use O-1 drill rod, since I keep a fair amount on hand. But many other steel alloys would work just as well - or better.