Just in case the stem becomes loose.
Basically I am building a bike for someone who had one arm a lot shorter than the other. If I had loads of cash if just get something made up to fit but the budget is non existent.
Anyway what I plan to do is have a normal headset/stem/bar setup for the “normal” length arm and then use a quill adaptor to extend the steerer a bit (yes they do work and types they are reliable) so I can mount another short stem on top pointing backwards.
Each stem will have half a riser bar on it and one brake/gear lever.
If the headset needs tensioning after it’s all done it would involve taking the quill adaptor out, installing a star nut and top cap, tensioning it back up, removing the star nut then replacing the quill adaptor.
I’d like some forks that have a steerer long enough so I could fit 2 stems on but I need about 250mm of steerer to do that.