Standard on the left, modified on the right
Chuck it up in a drill, run the drill the opposite way to a running bench grinder and trim it to size. Using a bench grinder maintains the roundness of the bit. A file, or angle grinder could also be used, extra care would need to be taken to ensure bit roundness was maintained.
Lastly or firstly if the hole is large enough for the bit to drop into place, cut a slot in the top to receive a flathead screwdriver. I used a die grinder. A file, hacksaw or super thin cut off wheel in an angle grinder would also work.
Pat self on head for a job well done.
Till next time
