I bought a new spinner and fore and aft bulkhead for my McCauley prop from Univair. They replaced a cracked spinner and old backplate. The quality of the bulkheads was significantly superior to the backplate they replaced--they even came with anchor nuts. The spinner came predrilled and the holes for the fore and aft bulkheads lined up perfectly--that is until I tried to install them on the prop. No problem with the fore bulkhead but no matter how much pressure we applied we could not get more than 5 of the eight screws to line up on the aft bulkhead (formerly called the backplate). They lined up side to side but not front to back. The spinner was rubbing against the prop blade. When we trimmed the spinner we were able to install it without difficulty. It helped to loosen the screws on the fore bulkhead. The Engineering Department at Univair does not recommend trimming the spinner but does admit that fitting a new spinner on an Ercoupe has always been difficult. I just don't believe the spinner should be in direct contact with the prop.
Mac McMahon N94184 VKX
