Mesh could be to tight. You want a little wiggle room all around the gear. A lot of the time a spur will not be perfectly round. If there is a high spot and you set the mesh on a low spot it will bind on that high spot and usually strip. When I set the mesh on my stuff I will check it, then turn the gear a little and check again. I just want to be able to wiggle the spur a little back and forth.