I received a used pain-in-the-@ss mountain bike that needed an entire overhaul. Oh, why did I even bother?....

Anyway, the final step is the seat-post. It is stuck like Lucifer in hell. I have tried absolutely everything; lubricating oil, heat, placing the seat post in a vice - the works.

The problem is that some IDIOT pounded the too-big seat post into the post tube (Don't ever do this). The post tube has a slight tell-tale bulge.

Anyway, it isn't coming out. No way.

The OD of the seat tube is 27.7 mm. What can I do? Can I cut the tube off, cut a slit along the post-tube slit, and insert another tube? Is this practical?

Are there tubes I can buy that will go over the 27.7 mm tube?

If you have been through this yourself, you know the frustration.