Threaded to threadless headset/fork?

Sorry to drag up an old thread, but has anyone done this? If so, how and pics would be great.

Used a threaded fork in a threadless headset/stem?

Yes, I had a fork with a long, threaded 1 1/8th steerer, put it in a frame with a shorter headtube and used a standard threadless ahead headset and stem. Stem clamped the threaded portion of the steerer but it was fine.

I read that threaded steerers are significantly weaker than non-threaded and that it was dodgy to clamp directly onto the threaded area. Terms like "stress risers" and the idea that stresses will be concentrated on the thinnest part of the tube (ie where the thread has been cut into the tube) make me very wary of doing this.

Makes sense to me.

I guess you could ask yourself this: "if the steerer tube were machined down so that the threads weren't visible, would I be happy to clamp on the stem?" - 'cos that's the true thickness of a threaded steerer in terms of dealing with the stresses that a clamped stem will exert on it.

it's been mentioned elsewhere but noones mentioned quillt-to-ahead adaptors in here. This allows you to use a modern ahead stem but keep your threaded fork/headset setup.

but this wont help if the threads on your steerer are furked...

unless you could use the adaptor to do the function of the star nut (pulling together the threadless headset)