CR-10 Spool holder Safety Washer

I had a light reel of filament falling off the open end of the CR-10 reel mount. I thought up the idea of just put a giant washer on the end to keep it from ever happening again. If its not big enough for yours on 1st print, simply enlarge the pattern. It screws onto the open end. And to change out reels, just unscrew it and take reel off, put on another reel and put washer back on, and put mount nut back on. This could be used on other single arm reel mounts also, just change your washer size.