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 Post subject: stuck seatpost
PostPosted: Sat Sep 29, 2012 7:39 pm 
Retro Guru

Joined: Wed Oct 27, 2010 2:43 pm
Posts: 284
Location: london
so i have taken a punt on buying a steel frame with a stuck seatpost, campag aero post so not keen to damage, has anyone actually tried coke to unstick one


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 Post subject:
PostPosted: Sat Sep 29, 2012 8:28 pm 
Retro Guru

Joined: Tue Feb 02, 2010 6:11 pm
Posts: 1846
Location: wellingborough
i doubt you will get post out undamaged . but who knows .

i ended up having one cut out of a nice John Fern frame set a while ago at great cost . i have also had one machine cut out a lot cheaper but it nearly took the frame with it .

best of luck


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 Post subject:
PostPosted: Sat Sep 29, 2012 9:37 pm 
retrobike rider
retrobike rider

Joined: Mon Sep 27, 2010 12:17 am
Posts: 877
Location: At The Gates Of Dawn
Loads of patience - loads of Plus Gas - loads of patience.
Keep soaking it with Plus Gas for about a week and then fit a saddle to the post and use it to get some leverage and see if it will move at all.

Good luck :D


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 Post subject:
PostPosted: Sun Sep 30, 2012 11:47 am 
Dirt Disciple

Joined: Sun Aug 12, 2012 10:13 pm
Posts: 19
Location: Sweden
Omega 631 is the answer.


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 Post subject:
PostPosted: Sun Sep 30, 2012 1:12 pm 
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Might be worth making up a little tool that mimics the rails on the bottom of the saddle. Weld up a pair of rails onto a long bar, clamp it into the seatpost nice and tight, then you have something to give the post a damn good twist.

Use a blowtorch to get the seatpost very hot, which might crack the bond on the corrosion. The seatpost will try to expand more than the seat tube, so this may be successful. Loads of WD40 once you get it moving, keep twisting it back and forth. It'll come - but don't expect it to be easy!


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 Post subject:
PostPosted: Sun Sep 30, 2012 1:13 pm 
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Joined: Wed Apr 25, 2012 2:08 pm
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Location: Shrewsbury
Depends if its really stuck, if there's any movement at all, it will eventually come free with lots of WD40. If its properly stuck the quickest way is to cut it out.

http://forum.ctc.org.uk/viewtopic.php?f ... +seat+post


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 Post subject:
PostPosted: Sun Sep 30, 2012 1:24 pm 
Dirt Disciple

Joined: Sun Aug 12, 2012 10:13 pm
Posts: 19
Location: Sweden
WD40 is useless in these situations when it's completely stuck


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 Post subject:
PostPosted: Sun Sep 30, 2012 3:30 pm 
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Location: Shrewsbury
lanab wrote:
WD40 is useless in these situations when it's completely stuck


Lots are just tight but feel seized. I've removed around 30 with WD40 and cut out 17 posts and stems :) But it keeps me out of the pub.


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 Post subject:
PostPosted: Sun Sep 30, 2012 8:44 pm 
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Joined: Sat May 22, 2010 10:33 pm
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Location: Suffolk
Plus gas, apply and leave overnight. Apply again and leave. Repeat until you want to put the post head in a vice and use the frame a lever. This should not damage the post and even really siezed posts come out this way. The last one I did (a chorus post in a steel frame) I applied plus gas every day for two weeks before thing budged (I tried iut everyday too). Fortunatley the customer was patient and I was determined not to damage a Chorus seatpost.

It came out in the undamaged. Plus gas and patience. I don't like the chemical methods either smelly or dangerous and I don't think coke will do much.


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 Post subject:
PostPosted: Sun Sep 30, 2012 11:58 pm 
Dirt Disciple
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Joined: Tue Oct 11, 2011 8:19 pm
Posts: 93
Location: Rotterdam
I managed to get a stuck seatpost moving alternating icewater and boiling water to break a possible bond, can't hurt to try this first over more destructive methods.


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