the little metal cover normally attached to a floppy has become stuck inside the drive is it possible to take drive out and take apart in able to retrieve or is it a sealed unit and a bin and replace job
You can usually easily remove the top cover of a floppy drive. I've done it many times in my work. You will need to remove it from the PC first. Sometimes there are a couple of small screws, other times the cover is just pushed on and will need a small screwdriver to prise it off. With the cover off, you should be able to shake out the foreign object. Make a note of how the ribbon cable is connected. If there is a problem with the drive afterwards, PCWorld sell them for about £9-99.
As a teacher (retired) I had this many times . I doubt if you would get it together again unless you has instrument tools and the fine motor skills. You may be able to retrieve the offending piece of metal using tweezers, BUT dont use metal tools, try to get those cheap plastic tweezers used in photography. At the end of the day remember that f;oppy drives are as cheap as chips so a new one wont break the bank
You could dessasemble the floopy drive to extract the metal cover just becouse inside the floopy there is a little spring wire used to return the cover to it's place, if do you not extract this wire, the same may goes to a critical pieces and make the 3.5" disk drive be out of order.