HP 82104A Card Reader Latch Set for HP 41C/41CV/41CX Calculators

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Replaces the latch set for the HP 82104A card reader. These are mirror image tabs with tension leaf springs. Note the orientation of the tabs because they are not interchangeable. I use 19 gauge wire, cut to 14mm in length as the pivot posts. Disassembly of the 82104A card reader (No warrantee is given and no liability is assumed. Proceed with caution because there are very small parts and very brittle plastic parts): a) Remove the black label using a broad-blade hobby knife. It's fairly thick but be careful not to cut an edge. Most of the adhesive is under the top half of the label. Work slowly starting from the top-right corner. b) Remove the three screws underneath. Later, return matching screws to their original positions in order to minimize cross-threading and creating more damage to the fragile plastic thread holes. c) Remove the two upper screws (A1 & A2 in the photo). This will allow much easier reassembly than by removing the lower screws. Again, remember which screw came out of which hole and replace accordingly. d) Loosen, but don't remove the two lower screws (B1 & B2 in the photo). e) Gently pull the top cover off (pieces may fall all over the place). It may resist separation because of the two metal spans of the top and bottom halves. They have 90 degree bends that can catch inside their slot holes. Use a needle tweezer to aid moving the spans. f) For reassembly, first install the curvy cover plate, then the tab and leaf spring for the port side, then the tab and leaf spring for the non-port side, and last the top cover. Before installing the top cover be sure that the leaf springs are in their holding slots on the back side of the curvy cover plate.