Over the past year I have been developing & building a seatpost removal tool, this tool removes posts that have become stuck into the frame overtime due to grease not being applied when fitted or not being regreased as often as they should be causing corrosion or rusting on steel, alloy & carbon frames / posts.
The tool works by mounting through the bottom bracket on the frame (cranks & bottom bracket is needed to be removed, in some cases a new bottom bracket will be needed when re fitted) then clamping to the post, the tool is then driven by a powerful hydraulic ram attached to guide rods to pull the seatpost out.
If you have a aero / oval seatpost (normally carbon fibre) the only way to remove at the moment is to drill a hole through the post to allow the tool to mount or to pull against the head of the post, this is also a much weaker way of removal but all that can be done at the current time.
Once the seatpost is removed from the frame the seat tube is then reamed out to insure there are no sharp edges or corrosion.
The seat tube is then honed out with a Flexi-Hone ball honing tool, this gives a nice cross hatch finish inside the tube to allow anti seize grease or oil micro channels to sit in keeping the new seatpost from corroding in again. Finally the inside of the seat tube is cleaned out with a nylon brush to remove any metal debris
Cost for this work is £60 - 80 for a successful extraction
If the extraction is unsuccessful £30
I do offer other methods off seatpost removal with Finishline Freeze Spray or penetrating oil and/or adding heat via a heat gun. These methods are cheaper and less risky but less successful.
This removal process does not come without its risk, the seatpost is sometimes damaged during the process due to the clamping of the tool or in some cases a hole is needed to be drilled through for a clamping rod to be fitted, it is also possible that the frame welds or carbon can fail due to the amount of force needed to remove the post before the post becomes free, (In simple terms the frame gives before the seat post / the frame is weaker than the force needed to remove the post)
This work I call a last ditch effort if penetrating oil, freeze fluid or other methods fail to have any affect. Customers need to be aware that frame or/& post failure is a possibility when this work is carried out.