Tandem Tom

So I am going over my touring bike LHT, and getting a new RD. I notice that the threads are quite worn out. I know there are a few options but would like to get your ideas. I do work PT at a bike shop and we have the Helicoil supplies. But I was wondering if the idea of adding some "weld" and then drill and re-tap would be a better option? My nephew has a might welder. Would this be the appropriate tool?
​​​​​​As we are getting ready for a 3 month eurEur tour I want to address these concerns.
Thanks!!

Tandem Tom

Just checked with our other shop and unfortunately we don't have the Helicoil for the RD. So that leaves the welding idea or I buy a Helicoil kit.

unterhausen

you don't have that size helicoil tap either? There are threaded sleeves that I like a bit better than a helicoil. Wheels manufacturing kit is a bit much for just one bike. Not sure if there are others.

fietsbob

An older type of damaged Rear derailleur hanger repair part goes in from the inside ,
you use a tapered reamer to clean up what's left of the thread, steel frame, right?
repair part, It's hardened steel , it jams in with its own taper..
thereafter to use a wrench to hold it by its hex head , while you unscrew the RD from the outside..
borrowing image from below .. only need 1..

Problem Solvers (QBP offered) has a substitute held on with your QR Skewer.. (G'gl finds that one EZ)




...

Canaboo

Would a stripped thread repair compound hold up in this application? Loctite makes one.

pwyg

Thread in the derailleur, if you can torque it down a bit without it spinning you are fine. It does not need a ton of torque to be safe. Loctite makes a thread repair filler and a metal filler. Those will back up your installation. Filling the part with silver an drilling and tapping it is also an option. As you can control the paint damage and keep it isolated on the drop out which is at little risk of rusting out due to thickness. The threads may look bad but be ok. I have delt with some sever issues with a good number of messed up hangers and they are all fixable.

wsteve464

10 x 1 mm Helicoil Kit, tap, drill and 10 inserts $25.50 on Amazon
https://www.amazon.com/Thread-Repair.../dp/B06Y5H77T4

No paint burning, removal no glue to come loose do it right do it once.

JohnDThompson 

The Wheels Mfg "dropout saver" is probably the easiest fix:


https://www.amazon.com/Wheels-Manufa.../dp/B000AO7C4I

After that, helicoil. Or melt brass into the damaged threads and cut new threads into the brass. Or replace the dropout entirely.

CliffordK

You could probably polish and clean everything up and braze those dropout savers in place.

Tandem Tom

A question about the Helicoil. The info,ma may I am not seeing it, does not seem to indicate how long the Helicoil insert is. If they are longer that's the dropout is thick would I have a problem grinding it down?

wsteve464

I have ground some down and no problems, put the helicoil all the way in and grind from the back side

CliffordK

I think 10x1 is a pretty common thread size, so you should be able to get the helicoil at any auto parts store.

That is, unless you wish to go with 10mmx26tpi (Campagnolo).

I think I've only helicoiled a spark plug, which is meant to pretty much stay put a lot of the time.

Tandem Tom

WSteve, thanks for your reply. A few videos I have seen suggest using Loctite Red.

unterhausen

helicoils have prongs to keep them in place. I don't know if you can find one as short as a dropout

Tandem Tom

I think my course of action is to go with Wheels Manufacturing Dropout Saver. Thanks for all the replies!