Doggone Seat Post Removal

I've got an alloy seat-post jammed in my 853 frame. Fucker won't budge - tried sawing and twisting in a vice. Looking now at going down the acid burn-out route. Any recommendations in London for this task?

Will it fuck up the paint job too? If so, is there anyone who would remove and re-spray?

Any help gratefully received

curtsy

http://theseatpostman.com/
Apparently keeps the paint safe.

That would save me a load of grief. Cheers @TheShipwright, I'll ping him.

Does anyone know how the hell he actually gets the seatposts out?

I've actually given up on frames before because of stuck seatposts, and then when they do come out they're absolutely fucked? When he pulls them out they are still mint condition.

I also can't think of anything more stressful than removing stuck seatposts for a living. I've done about 3 in my entire life and almost lost my shit with everyone and everything...

Is it possible he has a contraption that goes inside the seatpost and 'hooks' on to the lower end while pushing on the top of the seat tube? I'd bet that moving a stuck seatpost a few mm is probably enough to make the rest an easy job.

Or is he able to get seatposts out in one piece and leave both the frame and the seatpost in a useable state?

Think he uses a slide hammer plus various lubes and liquids.

Maybe this link will help you;
https://www.peterverdone.com/stuck-seat-posts/

@petrocks how much seat post is in the frame? I've cut one out before and depending on how much is left in the seat tube its can be easy, obviously the seat post is toast using this method.

PlusGas works wonders if you haven't already tried. Freed up a couple I've helped people with. If there's nooks and crannies it'll work its way in.

Slide hammer with a sprung round 'hook' type of thing on the bottom is what I have made in the past.

I've sawed into it, cut into quarters (a bit more since I took this picture. Bashed it with a hammer a couple of times and been trying to pull each segment out with clamp pliers. One of the four quarters just broke off half way down the length of the tube. Now anxious about doing too much damage

https://www.dropbox.com/s/m3rf5ep5j543i10/2018-11-02-13.38.jpg?dl=0

@MBroady, I'm using WD40 Fast Release Penetrant. Not used PlusGas - will it be more effective?

@TheShipwrightght. I estimate there's about 5 inches of post left in the frame

Fuck a duck. I've only gone and got it out. Only a tiny internal scratch where I was a bit vigorous with my sawing.

https://www.dropbox.com/s/td1wnilml6p3s4y/2018-11-02%2014.33.40.jpg?dl=0

https://www.dropbox.com/s/j05goyee3kprqqo/2018-11-02%2014.33.45.jpg?dl=0

Right. Any recommendations on post-post removal?

Scrub the inside of the tube to get any surface rust off. Could maybe put a bit of waxoyl on, then GREASE!

Edit: Congratulations!

How many streets away was the primal scream of triumph heard?

@Petrocks What type of saw did you use? Asking for similarly seized friend.

Ha ha @xrayspex- thanks. Doing it at work, on the quiet - so had to subdue my delight, somewhat.

@Tonts, I've just ordered some Kurust to deal with the internal rust, and I have 2 different kinds of grease - one purchased for bottom bracket, and one for the seatpost on my other bike. Can't remember which was for which :(

@finger_jockey I used a reciprocating saw with a wood blade - which theoretically couldn't do much damage to the steel...not foolproof though, as I did create a 1 mm score in the steel.

I think this would do a decent job though: http://bit.ly/2znk0nT

Nice one. Thanks for that, will bear it in mind for the inevitable day of reckoning.

I've got two stuck posts at the moment...

Vice unt plusgas but nicht movement :(

Usual method, if you don't have a reciprocating saw, is a normal long hacksaw blade. You can do some bodges to make it more comfortable (a cork on the spine of the blade where you want to apply pressure with your finger, some sort of stick through the hole that you can grip in your hand), and you need a large number of them because any hint of bluntness saps your morale too much to finish it...

When I think of doing it again, Seatpostman looks brilliant actually.

When I did mine I read a very good explanation about getting a carbon post out of a carbon frame by clamping the frame so that the seat tube would be slightly compressed lengthways and so, if anything expanded. Then the post was pulled under tension, tending to thin it. I guess he is doing something like this since he's working with all materials and so successful.

You will want copper grease for the Seat post.

Could maybe put a bit of waxoyl on

Don't do this! I've got Waxoyl in my frame at the moment (as framesaver) and the fricking seat post won't stay put. Grease is fine, but Waxoyl is too slippery.

Grease is fine

Yeah but not too much of that either, as I found out through experience.