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02-24-2005, 05:32 AM

On Wed, 23 Feb 2005 23:34:27 -0500, Sheldon Brown
<captbike@sheldonbrown.com> wrote:

> 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

I'm not sure that is is really the place for a Dr. King quote. Very
funny though.

02-24-2005, 05:32 AM	#20 (permalink)
dgk Posts: n/a	Re: Liquid Wrench On Wed, 23 Feb 2005 23:34:27 -0500, Sheldon Brown <captbike@sheldonbrown.com> wrote: > 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 I'm not sure that is is really the place for a Dr. King quote. Very funny though.