I like foam grips on my hiking poles, so when I installed a set on some "gripless" LightTrek 4s I needed two plugs for the top of the tubes.
As a result I now have 98 plugs that I don't need. They fit tubing with an ID of .500", and have a lip of about.050".
If anyone needs a few (dozen) let me know.
PM or email@example.com