2. If I try to use a female mould and insert a bladder and apply pressure then I assume I will get a pretty good final OD, but will it need to be an axially split mould or could I hope to get a finished part out of a simple tube with no draft angle if it is only over a relatively short length (30mm diameter over 100mm). Are there any good sources of advice out there on using bladders (which is a very standard method in the bike industry).