Threaded Head Set

[Yellow Saddle]

Cutting a thread with a die leads to a 'stress raiser' at the end of the thread weakening the component but with a rolled thread this doesn't happen which is why spokes have a rolled thread on them.
I seem to remember after breaking a fork on my bike I aquired a new fork but the steerer was too long so went to Sid Mottrams to ask about getting the threads extended and him telling me it was a rolled thread but this was nearly 50 years ago, ended up buying a new fork which made a big hole in my fag budget but luckily I didn't drink then (that started in 76)

My advice to the OP would be take the fork to a bike shop (not a retailer) or buy a new fork.

I've worked with framebuilders and built frames myself. Those threads are cut. I can still smell the cutting oil. Besides, rolled or cut, if they're worn away, the material is gone.

 

[Yellow Saddle]

not sure if I could go that far - i'm not good with money.
bound to be some in a skip somewhere.

If you can't afford a £20 fork, you won't like the bill for a repair to your existing fork either.

 

[Gunk]

not sure if I could go that far - i'm not good with money.
bound to be some in a skip somewhere.

Try a local bike charity

 

[Big John]

I work at a bike charity and I've been after a set of forks for ages now with no luck. Threaded forks seem to be difficult to find in the right length. Mind you, I'm after forks for a 25" frame and that's a long head tube.