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Chromoly 13/16" bicycle seat post with 7/8" seat mounting - 400mm
This is what I use. I’ve bought several and they are excellent. They actually are a better fit than the original seat posts. You usually have gently open up the top of the seat mast. I think I’ve used an old seat post to gently open the frame up. Then clean the the inside of the frame where the post goes in, very lightly grease the bottom section of the post and it makes for a really strong set up.
There’s many other options out there, usually associated with vintage BMX, but I can’t speak for those because I haven’t tried them.
A tubular tube is stronger than a solid tube, it has twice the surface area.
Back in the day Schwinn made/sold heavy duty seat posts for "heavy duty work" on the Chicago built models. They were sold as 12 gauge. Today it would be difficult to identify and source the part. It just looks like a normal seat post.
As already mentioned, the early Chicago Built exercisers have longer and thicker "heavy duty" seat posts. They were all 13/16" diameter up until they went with the large diameter seat post that has the adjusting pin/knob going through the post. They are available at y=ard sales every Saturday morning.