02-23-2005, 07:34 PM
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#11 (permalink)
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| | Re: Liquid Wrench
Andy Ksjls wrote:
>
>>I got a stuck seat post in a seat tube. Someone suggested Liquid
>>Wrench. I found it was just some lubricant. Will the more readily
>>available WD-40 do the job?
>
Jobst Brandt replied:
>
> That probably won't help either because, although you didn't say so, I
> suspect you have a steel frame and an aluminum seat post. When these
> two corrode together aluminum expands enough to stretch the seat post.
> Yours may not yet be at that point but it probably cannot be removed
> non-destructively.
Maybe so, maybe no. See: http://sheldonbrown.com/stuck-seatposts
> The way frame builders remove these is to saw them off, bore them out
> to a thin shell and grind away a slot in one side to collapse the
> aluminum remains to remove them. Oil bases lubricants will not help.
> An acid solvent might work its way in there but I doubt it.
Ammonia is good for this...I believe it's a base, not an acid.
Sheldon "Unnnggggggggh!" Brown
+-------------------------------------------------------------+
| If brute force doesn't work, you're not using enough! |
| --BOB Simon |
+-------------------------------------------------------------+
Harris Cyclery, West Newton, Massachusetts
Phone 617-244-9772 FAX 617-244-1041
http://harriscyclery.com
Hard-to-find parts shipped Worldwide
http://captainbike.com http://sheldonbrown.com
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