Yup, understood loud and clear..
I had almost the same thing on my A4000D last year.
Floppy would work fine when it was out of the drive cage, but screw it back in and it`d get read/write errors on almost every disk!
{Ashcroft}CBM, didn`t bother using the right length screws :pissed: , filed them down a bit and it was fine.