I'd been asked to turn down a motorbike triple tree (aka triple clamp or yoke), so a supplied bearing would fit on it. After much head-scratching, it was determined that a faceplate would be the most obvious option.
Of course... obvious != easy; it took a good 3 hours of tapping and adjusting to get the tube centered & running true. There must be an easier way...
Here it is mounted on the faceplate:
![](http://lister-engine.com/pics/TT_1.jpg)
I used the mill clamping kit to hold it; the shims are necessary to make the tube run true (another
![:thumbup:](https://madmodder.net/Smileys/default/happy0034.gif)
to Bogs, who gave me the brass shim stock that happened to be exactly the right size). I've already taken the first few cuts in the above pic. Because access was such a pain (the steering lock "bumps" on the yoke seriously impeded tool access), I ended up using the very edge of a Mircona parting tool:
![](http://lister-engine.com/pics/TT_2.jpg)
Small, slow cuts were the order of the day. I gradually whittled down the main diameter until the bearing was an easy slide fit down the majority of the tube; the goal was to make the last 20mm (the width of the bearing) a reasonably tight push-fit. In the event, I got it down to that level, but the final cut just ended up a touch over; so whilst the bearing sat nicely, it didn't grip properly. A smear of Loctite was therefore employed to keep the bearing in place. Normally, of course, it'll be squashed up against the cup with a hefty bolt, so in theory the loctite is unnecessary.
The finished article:
![](http://lister-engine.com/pics/TT_3.jpg)
I did get a little chattering on the final cuts, hence the slightly sub-standard surface finish; but this'll all be hidden away in a tube anyway, so it's no big deal.