Loctite is one of the manufacturers that produces rope caulk. It's very easy and safe to use. All home improvement and hardware stores sell rope caulk under one brand name or another. Once you see it, you'll understand why it's so popular for damping purposes. This stuff was all the rage twenty or thirty years ago. I still use it on my equipment rake to reduce ringing.
Your homemade tweaks?
Having just read bgmyers thread on isolating cables and some of the excellent ideas our fellow audiogoners shared, I thought it would be great for us to compile a listing of all the innovative alternatives and their uses we have come up with to tweak our systems in lieu of buying them from the pricey manufacturers.
I'll start it off with having used tennis balls as isolation devices under components.
I'll start it off with having used tennis balls as isolation devices under components.