Have some brass disks that I no longer use that you can have really cheap.I believe they are audio point products.If you want to email me,we can talk.
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Try your local hardware store (under plumbing supplys). I use 1/2 inch brass end caps. These are the brass threaded ones not the copper solder joint caps. Most are octaginal and have a little indent on the inside that is just right for the speaker cone point.
Costs about a buck each vs thirty or forty bucks for cone feet?