Hit it a lot, or wedge a big ass screwdrivew in it and work it back and forth, or if you dont want to break your screwdriver, use a chisel.
As for the rear drums thing- yes, they do suck, apparently what was wrong with my ebrake on my last truck (HARDLY worked, and wouldnt pull out more than 4 clicks) Was that someone halfassedly rigged it together, worse than even I would have done it, which I didnt know until just now looking under my other truck, and that ebrake works AWESOME.
That doesnt give them any more stopping power though, I was looking at this-
http://www.jcwhitney.com/product.jhtml?CATID=14754&BQ=jcw2
To substitute an ebrake, it would be a 4 wheel lock
Dave