I am not sure about these gloves that are out there but I have used a chef's philosphy and curled my fingers up to the tips and held the ruler with the tips of my fingers and kept that hand far enough in to the ruler that my rotary cutter is in no way shape or form going to get to my hands. I also have a neat trick that works well for me and put my pinky finger out over the left far edge of the ruler to hold it steady. That way your ruler is held steady and the rest of your fingers will be out of harms way......hopefully.
Hope your finger gets to feeling better really soon.
