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原帖由: Joe the Iceman ,

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Replace the nut with another nut and do not over tighten. If that doesn't fix it perhaps the threads on the jack are damaged. If it is a plastic bodied jack chances are it is the jack. As far as the loctite is concerned it is an ok idea but may not hold. Nail polish may work better. It is an old tech trick used to keep adjustment pots from moving as well as by manufaturers to keep nuts and screws from working loose and to detect tampering for warranty claims!

Before applying the loctite be sure  it is CLEAN. Loctite doesn't work if the parts are oily or wax coated and may not work on plastics. Also Loctite is anerobic that is it won't cure in the presence of air, that's why it stays liquid in the bottle. The one or two threads on the jack nut may not be enough for the loctite to cure.

To''' Remove''' something that has been "locked" with loctite '''heat it'''. Loctite is a plastic and heating will cause it to melt and allow the item to be loosened. For small nuts and screws the tip of a soldering iron works well. Most Loctite is good up to about 250 or 300 degrees F. Although there are some grades that are made for high temp applications most grades are not and that includes the "stud lock" grades.Consult loctite's web site for specifics.

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