there is an adjuster mechanism but you are not suppose to mess with it unless you are trying to take the drums off. If you do you must remove the rubber tab located next to the e-break line and use a really thin flat head screwdriver to move the notches on the adjuster. If you think that the breaks are not meeting up with the drum properly the suggest you remove the drum and apply high temp grease on the adjuster. If that doesn't work the spring located on it may be bad and you should buy a break hardware kit and replace them. In my opinion you should buy a new break hardware kit and possibly some new break shoes.
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To desert eagle, if you have drum brakes on the rear than yes there is an adjustment. It is accessed from the back of the backing plate and I think that it is a quadrant type adjuster. Better yet remove the drum and check out how it works as a picture is worth a thousand words. speedster1