A1 External Spool Holder Disc Mod

When using the external spool holder of the A1 on top of the gantry it can happen that the vibration leads to unwinding the spool to fast. So I wrapped the holder with 2mm foam rubber (and double-sided tape). To prevent the spool from vibrating off the holder I made this disc. Just flip it on and pull it to the end of the holder after wrapping the holder with the foam rubber.It should also work as fine without the foam rubber, so feel free.