My seatpost is stuck , no (not in my ass) in my frame... please help...

[Funkyworm]

Ok so im sure this has happened many times before but I have a Renthall seatpost that came with a bike i purchased the other day & it's  severely stuck in place in the frame  , i've tried spraying gt75 every day for the last 4 days where it enters the frame & also down inside the post in to the frame & then turning the frame upside down in order to get the oil to soak in from the inside . Then i've had it in a vice but it will not move at all.

Any methods that have worked for you guys wold be greatly appreciated as this is annoying the hell out of me.

Cheers

[oldschoolace]

Ah the old stuck seatpost conundrum   
First things first is the frame ali or steel?

[Funkyworm]

Ah the old stuck seatpost conundrum   
First things first is the frame ali or steel?

it's a 531 frame !

[oldschoolace]

Ok so melting it out gradually with caustic soda is a final option 

First try giving the post a sharp smack down further into the tube with a hammer to break the "seal" then try it in the vice again
If its slipping in the vice drill a hole throught the top of the post big enough for a decent sized alen key or something similar and try in the vice again

Other options are:
Cutting down the lenght of the post with a hacksaw blade, a ballache!
Drilling out with the right sized bit, difficult 
Heat? not the greatest of ideas usually
A bigger vice 

[Funkyworm]

Ok so melting it out gradually with caustic soda is a final option 

First try giving the post a sharp smack down further into the tube with a hammer to break the "seal" then try it in the vice again
If its slipping in the vice drill a hole throught the top of the post big enough for a decent sized alen key or something similar and try in the vice again

Other options are:
Cutting down the lenght of the post with a hacksaw blade, a ballache!
Drilling out with the right sized bit, difficult 
Heat? not the greatest of ideas usually
A bigger vice 

Ok I'll get back on it n the morning , Cheers for the er  (options) 

[ED209]

Callum I knew this was you just be reading the title 

[ED209]

you best bet is leverage 

clamp an old stem onto the post... put a piece of pole over the stem's 'stem'... put the frame on the floor...stand on it... push the pipe down ( gently back and forth )

The alloy post will either work loose and come out or snap off ... then you need to melt it out 

[spadey99]

Only Success ive had mate is heat........ But very very carefully....... 

[Funkyworm]

you best bet is leverage 

clamp an old stem onto the post... put a piece of pole over the stem's 'stem'... put the frame on the floor...stand on it... push the pipe down ( gently back and forth )

The alloy post will either work loose and come out or snap off ... then you need to melt it out 

Sounds interesting, ok well tonight i literally ripped the vice off of the bench (it was only G-clamped on but the whole of the bench top came off !!!!! Grrrrr been on the Protein (Not)...
Filled the post & frame with gt 85 sealed the end with plastic bags & tape & flipped the frame upside down to see if it works it's way between the post & frame on from the insde of the frame.
I'll leave until Sunday & If i cant get it out of the frame Im considering cutting down the post then getting out the dremel & cutting down the  recess at the back of the frame hen start cutting the post from the inside of the post outwards towards the frame if that makes sense ?

[oldschoolace]

The key thing is to break the "corrosion weld" by knocking the post down a bit first. Should twist out a treat then