I use olive or caper jars too. Tall and skinny.
I have not seen the ones with the hole that far down the from the end. You can also use the middle of the mandrel method, which should come up in a search here. You'd have to dip one end a bit to get it plugged, and then do the middle around the hole.
I made a hollow yesterday, and it was a total mess after getting it wound on and the middle closed. I did not take out enough glass to seal it with the rod, so wound up pinching it closed with my tweezers. It was u.g.l.y. Puffy mandrel fixed it right up! I love them.
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Kathy
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