Forgot to mention, in suppressor expansion chamber, in addition to the wire mesh roll, I inserted two coil springs, one on inside of wire mesh, one on the outside of the wire mesh up against the suppressor wall. Gives sound something to travel round and as said above gives water / gel something to stick to.
If you just want to do the springs without the mesh, just use the weapon mainspring trick of having the springs wound in opposite directions so they won't interlace. If you have a selection of springs (dismantle any automatic transmissions lately?) you might have the right size range to slip in three or more springs!
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