What’s the size of the Axis Mixtape axle?
If you need a new one, take it to a hardware store and see what fits. My guess for starters is a 4mm x .7mm thread set screw (length to fit). If you can’t find a set screw get a std. screw and cut the head off. Smooth the cut end with a fine file or a coarse stone. let us know what size fits.