[MrWzrd]

Anyone know the actual manufacturing / construction method for the double thickness propeller type two bladed fan?

What bonding method was used to secure the two layers to each other?

Were these fans balanced or just run as assembled?

If balanced, were they teeter-tauter balanced or center shaft balanced?

Also, was the pulley an intragal part of the fan or was the fan held to the pulley by the castle nut?

I'm replacing the sawed off four blade and have this one cleaned up and running true but it is out of balance.....seriously out of balance...