I felt the need to share this with others that use the drill & bolt system and drill the same tree more than once;
My first season with the drill & bolt system was 1983. But, it was only several years ago that I started using a cordless drill motor to pre-drill trees. I never considered using the cordless drill to re-drill a hole from the previous season. From experience I knew that it didn't work with the hand drill, and assumed that it also wouldn't work with the cordless. I just drilled a new hole near the other one.
I have no idea why it took me so long, but I finally decided to try re-drilling the existing grown over holes with the cordless drill on the first tree that I re-drilled for this season. I was surprised to see that it was much different than the hand drill, worked great, and took at least half the time.
My first season with the drill & bolt system was 1983. But, it was only several years ago that I started using a cordless drill motor to pre-drill trees. I never considered using the cordless drill to re-drill a hole from the previous season. From experience I knew that it didn't work with the hand drill, and assumed that it also wouldn't work with the cordless. I just drilled a new hole near the other one.
I have no idea why it took me so long, but I finally decided to try re-drilling the existing grown over holes with the cordless drill on the first tree that I re-drilled for this season. I was surprised to see that it was much different than the hand drill, worked great, and took at least half the time.