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I realize this isn't strictly a computer-related question, but I figured that if there's any place to go for help about a broken keyboard, it would be a power users' forum.

The O key on my Unicomp Model M has the tendency to strike twice. In other words, I press the key once, and it sends out two letters. There is probably a mechanical solution to this, but I'm not familiar enough with how these things work to come up with a fix myself.

Has anyone had this problem?

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closed as too localized by Ƭᴇcʜιᴇ007, KronoS, Simon Sheehan, Journeyman Geek, 8088 Jul 20 '12 at 11:38

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

Have you taken off the key, and tested by manually pressing the nub? – soandos Apr 22 '12 at 15:34
Have you tried emailing Unicomp? – paradroid Apr 22 '12 at 15:55

On a model M, I would try removing the keycap (both the outer and inner keycap) and spraying a small amount of WD40 deep into the switch, then replacing the keycap and actuating the key a few dozen times in order to clean the contacts (I wouldn't try this on a keyboard without mechanical switches though).

Don't bother with the above advice regarding taking off the keycap and expecting to see a 'nub' there, model Ms don't work that way (removing the keycap exposes a spring that has to be pressed in a very specific oblique way to buckle the spring and tilt the top contact piece so it completes the circuit, it's not easy to actuate without the keycap in place).

Edit: it turns out that a model M has a rubber membrane between the switch and the contacts, through which the switch exerts pressure. Therefore the WD40 probably wouldn't reach the contacts if you apply it from above.

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Consider using a contact cleaner such as DeoxIT instead of WD-40; these are usually friendlier to electronics than a general-purpose lubricant such as WD-40. – bwDraco Oct 22 '12 at 0:12

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