I am finally a proud owner of a 34c. Of course the batteries are dead, and when I put in normal alkalines out of curiosity I unscrewed the two little screws in the battery compartment. Unfortunately I couldn't screw them back in, the little plastic thingies with the thread crumbled away. First I thought it was the corrosion of the screws that busted the plastic, but then I noticed that the batteries put some pressure on the right part of the rear cover (when looked from the back).
My solution was to glue the little parts all together with a fair amount of superglue and then drill a new hole for the screws through the glue.
Hope that helps anybody, and never try to open a calculator if you don't have too!
Stefan
HP-34C repair
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