Originally Posted by berny
Then he simply didn't know how to do it. A patch like the one I show would strengthen the bottom of the original split and prevent it from splitting again. By moving the weak point up closer to the top of the seat tube and closer to the clamp you stiffen the whole setup.
I agree ,it should be gusseted , split a 1--2 inch length of ally.tube length ways &slide it over the end of the seat tube before replacing the seat post &clamp ,that should give it a bit of strength without subjecting it to anymore heat.Make sure the split in the gusset tube does'nt close up before the clamp tightens on the seat post. You could even epoxy bond it on once you got it fitting sweet. Are you sure that you have the right dia. seat post ? if it is slightly undersize it would cause the original prob.