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Some better ways to clean a tuning cap is with "canned air" or low pressure compressed air. Felt pipe cleaners are effective at loosening up the initial dirt/dust followed up by the air. Sometimes, it's best to remove it to clean but not always feasable or necessary.
Be careful not to jam or force anything between the blades, as that will change it's alignment and cause you other problems!
But for you at this point some air may help as either some cleaner/residue may be providing some conductance, especially where the alignment screws are. Also, if you take a meter to the movable blades or the shaft and the body you should see zero ohms/short. The stationary side shoud be isolated from the body.
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