Originally Posted by
DaveSSS
That's my picture. I used a countersink bit to add clearance for the top cap. This one probably used core foam to plug the steering tube and a 6mm thread insert that's normally used to add threads to wood, rather than a star nut. It's more difficult to get centered.
To each his own, but that seems to be a rather elaborate and labor intensive solution to provide something as simple as bearing preload.