Always used Aluminium on Otter. She was on a tidal mooring almost on 'Two Rivers Meet' at the bottom of the Stour, Christchurch. Most seasons they were very knackered - reassuringly! No leg problems or most other parts but the beginnings of an issue with Volvo Ali props which surprised me. Sorted soon enough but had not expected that as they are supposed to be 'top banana' and not 'rot banana'