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Just got a Corona 3 Folder and it's in overall great shape, even the case. The only issue is that the space bar sometimes functions correctly and sometimes does not. It will go down, but not pop back up to complete the cycle and move the carriage. Any help would be greatly appreciated. Also, all of the keys function great, it is just the space bar that acts this way.
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Sounds like some grease/gummed oil. Try cleaning the joints that are for the spacebar underneath the machine with rubbing alcohol, or grease remover, etc.