I have a 2' length of heavy steel pipe and give it a hard bonk on the head. This thread started a while ago, hopefully Mosherd1 has had lots of practice by now. The one challenge to a hard hit on the head is if you hit too far back it bruises the neck meat and doesn't knock the rabbit out. If you hit too far forward it breaks the nose and makes it more painful for the rabbit. Either way it prolongs the process.