Google gave these..makes me nervous
Instructions
Step 1
Place a cardboard tube on top of the dome and suck the dent out with your mouth. This is a good method for very soft cones which could be damaged by the methods below.
Step 2
Stick a piece of masking tape onto the dent and gently pull up on it. Try to pull the dent out with the tape. You can also try using duct tape, but it may leave a sticky residue on the speaker dome.
Step 3
Place a shop vac hose or a hose attached to a normal house vacuum directly over the vent. Turn on the vacuum. As soon as the dent pops out, turn off the vacuum. Do not attempt to pull it off the speaker dome while it is turned on! This is similar to the method in step 1, but more powerful. Try the first method first, since this can rip some thin silk or plastic speaker domes.
Step 4
Bend a small pin at a right angle and poke it through the center of the dent. Turn the pin so that the bent part is perpendicular to the dent and pull it straight up. When the dent pulls out, turn the pin again so that it slides out of the speaker dome.
Step 5
Glue the end of a dowel or a block of wood onto the dent with hot glue. Hold it still until the glue dries and cools (about 20 seconds). Then, pull the dent out by pulling the piece of wood away from it. Once you have pulled the dent out, peel off the glue.
