This weekend I "restored" an old but good looking HP-67. Restored for me as a total ignorant in hands-on electronics means I took it apart, cleaned the keys with alcohol dusted off the PCBs, replaced the gummy wheel and assembled it back together. Then I realized that the sliding switches are a bit harder to push. They do slide but not smooth. Then after the fact I read on this web site that you are not supposed to clean the grease under the sliding switches. My question here is should I dismantle it again and put some silicon grease under those switches. Is it worthwhile? Could the little metal tabs that actually glide on top of the contacts get worn off sooner if there is no grease? My questions can go on and on.
The reason I am hesitant to open it again is the back label already looks not so perfect from lifting the edges to access two middle screws. I am afraid that I will ruin it totally.
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