Thanks for the comments
I was expecting the new column to be a smaller diameter than 17mm. It was advertised as for the Sierra and has the triangular connection one end and the correct splined shaft at the other.
I must admit I took a bit of a guess on the tube as I was placing an order along with some other bits and wanted to combine postage. It was as someone had suggested on locostbuilders and I was away from the build so couldn't check. There is no way it will fit on the column I have without drilling a lot of the inside of the tube, which will reduce the wall width considerably.
The problem with the first column is that the diameter is even bigger than the 17mm replacement one. I had read that the extension tube can't be too big or it will foul one of the uprights.
I will keep my eye out for some 17mm ID seamless tube with a wall thickness of 3mm.
Cheers
Eddy
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