Backstay hardware, threaded or not?

[L124C]

I'm removing my backstay for inspection and lube. I want to remove the round piece (Name?) at the end of the backstay (see pictures, sorry, one's out of focus). It looks like it is threaded onto the backstay, but then again, maybe not. I've used penetrant and it doesn't want to unthread. Don't want to force it if it's not treaded. Thoughts?
I'm planning on performing a corrosion dye test on the members.

[treilley]

If you are referring to the rusty part, that does not come off. It is part of the threaded section. The flange around it will slide up over the threads if you spread it far enough.

Personally I would not bother. Just replace it. That rust looks pretty bad.

[L124C]

Originally Posted by treilley

If you are referring to the rusty part, that does not come off. It is part of the threaded section. The flange around it will slide up over the threads if you spread it far enough.

Personally I would not bother. Just replace it. That rust looks pretty bad.

Interesting. It looks like a barrel bolt. I can definitely see a couple of threads above it, and it has a through hole with the threaded section showing on it's bottom. So, do they press it on somehow?

[treilley]

If you see threads than it must be threaded. But it would be pretty bad if it were with no way to prevent it from unthreading. I believe it is pressed on.

[L124C]

Cleaned up nicely. Now I can see there is what appears to be a pin running lengthwise through the Barrel nut (for lack of a better term!). Wonder if they thread it on, then drive a pin through it and the threaded member?

[knothead]

Originally Posted by L124C

Cleaned up nicely. Now I can see there is what appears to be a pin running lengthwise through the Barrel nut (for lack of a better term!). Wonder if they thread it on, then drive a pin through it and the threaded member?

That is one way that they are made. They also just use thread adhesive sometimes. Either way, IMO those are inferior to welded T-bolt or eye/pin t-bolt.





I have seen the threaded ones crack from the expansion of the corrosion that occurs in the interstices of the threads.
I have seen them fail completely under load in extreme cases.

My recommendation would be to replace them when you do your next rerig at least and in the meantime, do exactly what you are doing. Clean them, inspect them and then soak them in something that will stop corrosion.
Then watch them closely.

[L124C]

Originally Posted by knothead

That is one way that they are made. They also just use thread adhesive sometimes. Either way, IMO those are inferior to welded T-bolt or eye/pin t-bolt. I have seen the threaded ones crack from the expansion of the corrosion that occurs in the interstices of the threads.
I have seen them fail completely under load in extreme cases. My recommendation would be to replace them when you do your next rerig at least and in the meantime, do exactly what you are doing. Clean them, inspect them and then soak them in something that will stop corrosion.
Then watch them closely.

Very helpful, thank you! The dye test "illuminated" some corrosion around the top of the barrel nut which is what initially concerned me. One end of the pin I mentioned is also corroded. So...it didn't really tell me anything I didn't already know (with the exception of something I will address in a separate thread). However, combined with your experience about failures, this is not good! The rest of the backstay appears to be in great condition (and is overbuilt to begin with). Your post makes me think that I can replace the barrel nut with one of the arrangements you suggest. Thanks again!