Wheels Of Steel

Specifically in Kaisei? Or do any of y'all have sumtin' in Ishiwata? May need one in future, threads are about buggered on the fork of a frame I quite like.

unterhausen

crown races are part of the crown, not the steerer. Crowns are way oversize to start with, you can cut them to fit JIS crown races on a lathe or with the proper tool (I didn't know you could buy one though)

Wheels Of Steel

Ah, enlightening. So I could have the crown cut to 27.0 or 26.4 depending.

fietsbob

Nice time to own a caliper to take your own measurements..

you will find having one, useful, lifelong.

Andrew R Stewart 

Yes. But I will add that cutting down a crown race seat is not always as straight forward as one might think. So it's best left to a guy who knows how to do it. It's easy to cut too much and end up with a slightly loose fitting headset crown race.

A builder could mimic the current fork dimensionally so don't damage or toss it yet. I would let the builder choose the materials. There's reallt not much difference between 1" steerers. Although the motivation to retain original spec for colectors value does have it's merit, if the bike's value justifies it. Andy.

Homebrew01

Or get the fork fixed. Several options depending on how bad it is and value.

Wheels Of Steel

I regularly use a set of Mitutoyo digital vernier calipers.

The keyed washer cut into 2-3 layers of threads on the steerer. Removing the old headset helped chase them, but it was still a bit rough when installing the new headset. I'm thinking ahead here.

fietsbob

Aluminum Keyed spacers, its the Key that gets cut into.



FWIW, older shops that sold the Frames of many Name Builders, italian , Etc.

were expected to do the frame prep , at the Retail end of the supply chain.


so those Campagnolo complete tool kits included all the cutting tools to do that.

JohnDThompson 

That's trivial to fix, and won't even wreck the paint. Just melt some brass into the damaged threads and cut new threads into the brass. Then use an aluminum spacer as fietsbob suggests.

Andrew R Stewart 

If the damage is what I'm use to seeing a quick use of a die should clean up the threads. Are the threads damaged all the way around the steerer? To the point of "smooth" metal between the good ones? Even if you do go the laying in brass and recutting you'll want to chase the threads first so just stop at that point and reassess. Andy.

Wheels Of Steel

2-3 layers, 1/8 of the way 'round the steerer. Yes, the keyed washer was cutting into the threads.

JohnDThompson 

It's likely that simply chasing the threads, as Andy suggested, would be sufficient. At least it's worth a try before moving on to more drastic measures. Any chance of a photo of the damage?