it's not ideal but sometimes you can hammer the post (what's left of it after chopping the top off) down into the seatpost with a slightly thinner post and put a new one on top - not nice but possible - remove any bottle cage bolts from seatpost first
it's not ideal but sometimes you can hammer the post (what's left of it after chopping the top off) down into the seatpost with a slightly thinner post and put a new one on top - not nice but possible - remove any bottle cage bolts from seatpost first