Finally, I don't know why, but this worked. My 901 adapter worked fine with my protege, but I couldn't get my 510 to work, except randomly. After I watched your video I took my switch apart again (for the 100th time) and turned the flat parts up. All of my adapters work great now and have been for a day and a half, and I don't have to set the adapter in a special place or put hard or anything. They just work.
I was ready to send it back, but I hated to part with it.
Thanks so much Johnny 5!! You saved the day!