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they melt out the ally seatpost using a torch...
Yeah, I’d be giving a few other things a try before putting that amount of heat into it.
Hacksaw blade by itself is a fools errand. Get a dowel, cut a slot (with the hacksaw blade or another saw) and glue the hacksaw blade into it, the dowel will keep the blade rigid and make it a much easier job.
M_V
Unfortunately I don't have access to a reciprocating saw. Bikefix will do it; they melt out the ally seatpost using a torch for £60, however, I'm minded to give the hacksaw blade by hand a go first so I don't end up having to anihilate the paint. Anyone had any luck with this, and if so, how many hours of sawing are we talking?
Given the post is cut flush to the seat tube, I'm thinking I may need to cut a couple of slots into the post before knocking the pieces downwards into the frame to disconnect them from the inside of the seat tube.