What I've been doing while being too lazy to order the bolt adapter for my Bitz is using a pencil top eraser with a notch cut into it so it'll fit into the standard nock receiver. I did have to shave the corners down a little bit to make it fit better on the one I dug out of my son's old school supplies. It works, but it's certainly not an acceptable long term solution. Call it 'For Emergency Use Only.'

These are the erasers I'm talking about. They fit onto a 22/64 diameter shaft just fine.