Calculator blog

Musings and comments about our common interest


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second attempt to card reader side lock

I have received the second prototype of latch for the card reader. The first had not exactly the right dimensions. This second, while OK in the dimension side, does not provide enough spring action to have the latch "lock" in place. We need to angle more the leg (just like the original) so that it provides enough torque so that it latches into the calculator.

On the aspect side, it is good enoug. It will be sold always in pairs, so that no one will be able to see the difference between an original one and ours. Please email to if you are interested on the product!


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Card reader side locks prototypes

I have had the time to test the initial prototypes for a replacemento for the often broken card reader side locks. Still a couple of angles to fix, and also add some texture to the figer pressing areas - and it will work! It does not require metal legs to work, but it uses the relative flexibility of a the P12 nylon stud to act like the metal band. It is integral to the piece so it will not disconnect or fall during assembly - as we are tired of suffering when reassembling card readers! If anyone else is interested, please drop me a line at





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