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Which approach next?
Caustic soda 57%  57%  [ 8 ]
Hacksaw blade 14%  14%  [ 2 ]
Drill it out 0%  0%  [ 0 ]
Persist with anti-seize and quill stem 29%  29%  [ 4 ]
Total votes : 14
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PostPosted: Fri Jun 15, 2012 2:18 pm 
retrobike rider / Gold Trader
retrobike rider / Gold Trader
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Joined: Sat May 09, 2009 11:46 pm
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Location: East Riding of Yorkshire
I recently acquired a 1993 GT Richter 8.0 frame, only to find out it has a severe case of stuck seat post.

I've tried a week of soaking with PlusGas and then trying the LGF method of inserting a 1" quill stem and bars, but to now avail.

So which approach should I try next?

Considerations:

* The post is sheared off about 2" down into the seat tube, but different heights all the way around with a jagged edge

* The paint isn't in great condition, so it will probably need repainting anyway

* The seat tube is cracked at the top, where someone has clamped in a smaller diameter seat post above the one that is stuck, so that will also need repairing

* I think I measured about 200mm of seat post stuck in there

I've pretty much read through every thread on stuck seat posts, but any advice gratefully received.


Last edited by kingoffootball on Sat Jul 07, 2012 10:47 am, edited 1 time in total.

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PostPosted: Fri Jun 15, 2012 2:37 pm 
Old School Grand Master
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Location: Behind you with the duct tape pulled out.
Cant see the quill stem method working on this one. Surely it will just expand the post in the frame making it harder to get out. Think chemical attack is your friend here. Dont forget to film it :lol: .


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PostPosted: Fri Jun 15, 2012 2:42 pm 
retrobike rider / Gold Trader
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Well, I have a frame in with my local engineering company, they are cutting a thread into the stuck alloy seatpost, then screw in a bar and using a reverse hammer (Think thats what he called it) to extract it. The jolts in both directions un-seize it and eventually the whole thing comes unstuck and your left with a Frame without a Stuck Seatpost. Simples.

Jussa :)


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PostPosted: Fri Jun 15, 2012 3:22 pm 
retrobike rider / Gold Trader
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The reverse hammer sound intriguing, but unless I can fashion something similar from the tools in my garage I might have to rule that method out!

I'll try to put up a picture over the weekend to illustrate the state it's in.


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PostPosted: Fri Jun 15, 2012 4:06 pm 
Retro Guru

Joined: Wed Jan 18, 2012 12:37 pm
Posts: 426
Location: Derby
If it was mine i would try driving it a bit further into the frame with a hammer and a old seat post to get it moving, then use penetrating oil and the lgf method to try and get it out of the frame.


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PostPosted: Fri Jun 15, 2012 4:31 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 8222
Location: New Forest, UK
Caustic soda for me. The frame is a repainter anyway with the crack repair. Hacksawing it out is a horrible job.


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PostPosted: Fri Jun 15, 2012 5:02 pm 
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Location: Manchester, UK
hamster wrote:
Caustic soda for me. The frame is a repainter anyway with the crack repair. Hacksawing it out is a horrible job.


Agreed. Caustic soda is nasty stuff but quick and easy if you need to repaint anyway.

If there is a remote possibility that you won't repaint, give it a few days with a combination of Ammonia and the quill stem method as no damage caused. That's my preferred method, although decent strength Ammonia is getting harder to come by these days.


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PostPosted: Fri Jun 15, 2012 6:27 pm 
retrobike rider
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kingoffootball wrote:
The reverse hammer sound intriguing


I think by the sounds of it they are going to try using a slide hammer on it something like this. A thread will be cut into the seatpost then a long piece of allthread screwed into that. Then a heavy piece of round bar with a hole through will be slid over the allthread followed by one or two nuts screwed onto the end. Then they'll continually use the heavy piece of bar to smack against the nuts on the end, hopefully pulling the seatpost a little with it each time. Hope this makes sense, I'm crap at explaining things.

Sounds like a good idea to me :D .

Here's a stock photo of a slide hammer that I found........


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PostPosted: Fri Jun 15, 2012 6:43 pm 
PoTM Winner / retrobike rider
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Location: East Yorkshire
Caustic soda ftw Will, just dont forget to invite me round to 'assist' :lol:


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PostPosted: Fri Jun 15, 2012 9:39 pm 
retrobike rider / Gold Trader
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Location: Norfolkshire
weeman_mtb wrote:
kingoffootball wrote:
The reverse hammer sound intriguing


I think by the sounds of it they are going to try using a slide hammer on it something like this. A thread will be cut into the seatpost then a long piece of allthread screwed into that. Then a heavy piece of round bar with a hole through will be slid over the allthread followed by one or two nuts screwed onto the end. Then they'll continually use the heavy piece of bar to smack against the nuts on the end, hopefully pulling the seatpost a little with it each time. Hope this makes sense, I'm crap at explaining things.

Sounds like a good idea to me :D .

Here's a stock photo of a slide hammer that I found........


That's the bad boy :) works a treat and no messy chemicals :D


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