That's right, i found a drone killer resonator, I bought one of FTE resonators and its the bomb. I have stacks and the dreaded Cummins drone, i couldn't even talk on the phone while running down the freeway. Here is there WEB SITE IF you want to get rid of the drone this is the ticket.
You can buy pre-bent auger flighting without the center rod from many metal shops, at least in my area. I'm assuming it's the auger flighting and not the center rod that is killing the drone.