My wife likes a very upright riding position. Pic shows chrome moly steel tube extension with commercial stem added. Positions handlebars higher and more rearwards. The size of the stem versus the required inner diameter of the Birdy steering clamp meant that the tube had to be thicker where the clamp goes. Brazed shim onto the tube to achieve this. I'll see how she likes it then add the little button (that gives the required fail-safe registration) and paint.