I finally got someone on the phone at Hallmark. I was lucky to get through because they just returned from a 10-day summer vacation and are swamped with calls. Well, everyone is entitled to a vacation but they might have had a phone recording explaining that, or a banner on their webpage instead of an easy-to-miss notice near the bottom.
In any case, I was told that the tube tends to freeze in the floor and table holders. Lubricant and a lot of forceful wiggling will free it which worked. Of course, one of the thin aluminum holders broke when I forced it so I now I must replace the $7 part.
Hallmark said that I should put wax on the pole ends to prevent the problem. Something else to add to the yearly checklist for those of us with these pole style tables. They added that a new table design was adopted recently.