With some ingenuity, those Cobras you are trying to sell will make the best steep ice leashless tools going. I've done it to mine and a friends using Viper Fangs. You only need to remove a TINY bit of plastic. Don't remove too much! A sliver in front of the bolt and a bit where the front spike is located. Then bolt it together and squirt a bunch of 2 ton epoxy inside of the Fang in order to get a perfect fit, it will drip like mad when it heats up, so stay on it for a while. Put the epoxy in by using a zip-loc bag with a pin-hole in the corner, (like a cake decorator).