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well i got mine by going to mail boxes etc and picking up a 3 inch poster tube and used the caps from it. They aren't the toughest things in the world, but cheap.
Why use wimpy plastic ones?--you could get some big metal freeze plugs,or
maybe the rubber expandable ones!?--or maybe the caps they use on chain link fence posts,I think they are available in 3 inch size...they look like the caps on 2wd front wheel bearing hubs....