I've used this tool for 30 years.

http://www.sears.com/sr/javasr/produ...cemgdffmdfko.0

The driver will fit all your common 3/8 (and 1/4 drive stuff with a standard adaptor)
Grab your Dremel "cut off" wheel attachment and cut off a one inch lenght of Allen
wrench of the correct size, and insert into a suitable six point socket.( One wrap of electical
tape at one end before inserting will give it a snug fit if you like.)

Just a couple rather light taps on this small stuff an out she"ll come :-)

If a small enough socket is unavalable, Sears also sells special "Allen" wrench sockets.
Also Harbour Freight sells simalar stuff of questionable quality for "once in a blue moon"
use.