Sounds like your input jack nut came off the back of the jack. Get a mirror and put into the sound hole and see if you can find the nut and washer. You will need to adjust the nut and washer to allow the shaft of the jack to protrude through the body and install the washer/nut on the outside of the body. The strap button fits over the shaft. You can get an idea from this link.http://www.frets.com/FRETSPAGES/Luth...x/matrix3.html You may have to go back/forward a page for more info.
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Acoustic bass fetish club # 47
Praise and Worship #900
