Adding mass to PR's

[topp]

I have a pair of Stryke Audio PR15-1050 that I would like to add about 350 grams to each. These do not have any threaded rods sticking out the back, so I am wondering what is the best way to do this? I have read to use modeling clay and/or washers, but I am not sure how I would attach them. Do you just super or hot clue it?

Thanks,
Topp

[derekbannatyne]

I think you just shove the clay inside the tube that's located where the voice coil would be in an active driver.

[collo]

You can weigh out some lead shot and mix it with epoxy resin - pour the lot into the "coil" former

[topp]

What keeps the clay inside the tube? Does it stick by itself or do you add glue?

Thanks,
Topp