Tech question - Rethreading Forks

[PurleySquire]

The thread is wearing out on a pair of forks and the lock nut won't tighten up enough and slips a thread, I admit it is most likely my own fault for giving it a spot too much torque.
I have tried another lock nut and coating the thread in Locktite, both provided a temporary respite.

So what next? Is it better to replace, I have a suitable donor available, but it is too long.

Does anyone know of a bike shop (South London based pref.) with the knowledge to extend/repair the existing thread?

 

[A.D.R]

I'm not a bike mechanic or engineer so I'm no technical authority on this but you might have stripped the threads a little if the Locknuts slipping I don't think running the thread die over it will do any good, sounds like you need to put material back onto the threads, and have them re cut to the original size and depth, i.e having someone weld on beads of weld all round the steerer tube then grinding that back to the original outside diameter of the steerer and then getting the thread recut. and that sounds like a lot of work if its even possible without messing up the steerer completely. Might be replacement fork time sorry.

Hopefully someone with more experience here will be along with a more informed opinion.

Andy

 

[THE ARS]

http://chrisking.com/headsets/hds_gnut

 

[cyclotoine]

You could buy one of those lock nuts that have a bolt to cinch it down. That should keep it tight. There is no way to repair the threads if they are stripped. Are you sure the lock nut isn't what is stripped? The fork threads (unless it is alloy) should be harder than the locknut.

 

[andyz]

http://www.ebay.co.uk/itm/1-HEAD-SET-LO ... 0996616082

Bit cheaper than a Chris King.

 

[hamster]

Are you sure that you have damaged the threads on the fork? More likely it's the headset, in which case a new lock nut should do.

 

[danson67]

Try a different locknut for starters, is the original aluminium or steel?...you don't want to be re-threading the fork if not necessary.

If it is the fork thread that's damaged, I'd suggest having some brass run around the thread to build up the material, rather than weld. This would be far easier to run a die through to re-establish the thread. Local framebuilder?

All the best,

 

[shedobits]

Mario at Vaz Finishes in SE13 would be worth a call on 020 8852 0711 or 07956 314216.

 

[Lord_fowl]

it is possible to extend the threads,,, i had this done at a local bike shop this summer with no problems whatsoever
lf

 

[WD Pro]

You could buy one of those lock nuts that have a bolt to cinch it down. That should keep it tight.

That's what I was thinking as the first / easy thing to try :





WD