My top rail was 1 1/4" and it was definitely flexible. I'm in Canada and I don't know who sells 1 3/8" top rails around here. Lowes and Home Depot don't have 'em. The 1 1/4" ones that I found were from Rona. I would take a picture but right now it's in a bamboo / amsteel / fence-pole heap in the backyard. I might have to drive to the US just to get my pipe. I see that lowes in the US sells it...
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