Its simple to repack them,
(buy two packs of silencer packing at a local dealer.)
First un srew all the screws at the very tip of the silencer.
Then try pulling on the unscrewed end of the pipe. after it comes out you should see a kind of metal hose looking thing. tightly roll the paking around it and shove the end into the back of the silencer. Then repeat for other silencer.