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Tijmen
@neilbah
it has been bonded now at both points. I have laminated the tube so it has a step that butts up against the steel at each end, like double butted tubing but externally - it has more of a vase shape now than a straight tube. I have topped it with a slightly more cosmetic UD carbon layer. I bonded in a couple of inches of 25mm seatpost in the top of my integrated post to provide the clamping area. The section of steel tube i removed weighed 291g. I replaced it with material weighing 100g ish so its considerably lighter. This was no thoroughbred frame to begin with but it now weighs 1967g in a 60cm size which is pretty decent considering i dont need to add a seatpost.