65 Valiant wagon tailgate manual window crank

Messing with my wagon still. I have the manual window crank for the rear window. The knob or piece that you hang on to is really wobbly, like it might fall off. Does anyone have a fix or modification for this to fix it? The knob is on a post. The post slides through the window crank handle and the end of the knob post is smashed or mushroomed out to keep it from falling out of the handle, no bolts or nuts or hardware of any sort.