As promised here are a couple of pics of the little needle changing tool I made for myself..........
Take a childs glue spreader and trim off a little of the flexible blade.
Pierce a hole just big enough for the lower part of your needle to slip through. I used a tiny Fiskars plier punch but if you don't have have one you could hammer a tiny tack through it to make the hole or maybe heat an old machine needle and push it through.
And here it is in action.
Use it to remove and insert your needles and you should never have a problem again with them dropping into your feed dogs.
I hope you find this useful.