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Warning [2] Attempt to read property "messages_in_thread" on null - Line: 5 - File: inc/plugins/threaded_mode.php(305) : eval()'d code PHP 8.1.2-1ubuntu2.14 (Linux)
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Problems with the HP-41's keyboard



#2

Keys which had lost their feedback it's a very common problem with older HP-41s, so I opened my calculator and I saw that the perforated rubber pad under the keys is now completely flabby and cannot guarantee the feedback of the keys. Any suggestion for a correct replacement? I tried with many possible repalcements but none of them are good...


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