-=> Quoting Alexander Bilan to Landon Robinson <=-
 >There is no hole on the back side of the backing plate to adjust them
 AB> Landon, if you look at the backing plate of GM drum brakes, you will
 AB> see a faint outline of a standard knock-out as found at the rubber
 AB> plugged front adjustment hole (if equipped with front drums). Sometimes
 AB> the BFH and a punch will get them out. Otherwise, drill it out to size
 AB> so you can put a plug in it.
And speaking of plugs, good auto parts stores will carry the oblong rubber
plug to replace the knockout with.  They're cheap, and help keep debris
from entering the brake area.
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