Which NEU for my 10.5v Lithium-Ion

[Gee]

I like my dremel but I do have a couple other corded models that pick up the slack. Before I got into this hobby anything of this nature was a disposable product. Now it seems it is more of a challange. A replacement motor isn't going to be too much $ the hardest part will be removing the dremel portion from the motors shafts. Any ideas on that? Other then that it's just a couple of connections. It will be worth it if these dremels still go for close to 100 buck.