So if I understand you correctly, I will CA now, turn a little and CA again as I approach the size I want? Thank you!I've done quite a bit of antler in the past. Thin CA is your friend here. It will firm up the pith as you turn it to size. Take your time, wear a respirator and have fun.
Mark I do want to use your technique to hopefully retain some of the bark sometime. I did buy those rubber gripped vise grips to use like you are doing. With these pieces I chose to square them on my table saw and put them in blank jaws for easy center drilling. I was surprised to see how much of the marrow area showed up. I feel like the outcome will not be as nice with the pith being so big.