new seat post with a sleeve for strength
new post test fitted, all good at this point
new post then trimmed to fit
nice amount of clearence
then it all goes wrong, i spot the faint line of a liner in the seat post casting, and decide the if i can get it out and run the seat post through the casting it will be a lot stronger than just welding underneath. unfortunately this means remaking the seat post and cut out.
another seat post made and liner now removed, i knocked the new seat post through the casting, only to find it would not line up with the old part of the seat post
after a lot of swearing i finally managed to get the to together, just needs welding now.