I have been working on this a little bit. The biggest concern I have run into is making sure the spear handle portion stays true to the shape. On some of the designs I have seen there is some variance in the size. However, you can't make the pole-arm handle too thick or I wouldn't expect it to be easily held in the hand. The one I am currently designing will be retractable both ways. I can definitely see it being used in the gauntlet as well. i will draw a little schematic on paint and put on this post for others that are working on this.