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Discussion Starter · #1 ·
I have used upholstery foam and a sock over the cartridge frame before but want to know if anyone has any better ideas :)
I have a Penguin 350 if that matters.
 

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Discussion Starter · #5 ·
Wow, thanks everyone. I don't need to change the cartridges yet, but at least I'll be prepared when I do :)
 
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