First prize. Thanks Rui your 25.6mm foot fits the tubing perfectly, like a sock on a chickens lip.
Now need to address the opposite end, the lock corner. Do you think that adjusting the scale and reprinting is the best way to go, or should I rather sand the old ones out? (Do not cherish making a plan and that extra labour to be honest and leaning towards re-scaling) I am guessing they will protrude slightly below the bottom corner piece. Going to try one at 1.02 scale.