Many thanks for your input: much appreciated. i have not attempted to restore any of these items, only remove corrosion and try to prevent its recurrence. In the case of the Sunderland wheel, there was surface corrosion beneath the plastic coating even before the aircraft was scrapped, and the corrosion was already starting to blow the covering off the wheel. Then some clod decided to break-off the ancillary control buttons and their support ring while the old boat was still in the “mortuary”, at which stage I removed the wheel before further damage occurred.