Scullin Disc Drivers

[cactustrain]

I belong to a 12 inch live steam RR in St Louis Mo.Our locomotive 401 needs new drivers.We are exploring several options and one of these options  is disc wheels.I was wondering if anyone in this RR comunity might have spects or other any info .on these type of drivers. 

Thanks.

[cacole]

Here are 6 for sale on e-Bay --

http://www.ebay.com/itm/1-1-2-Scale-Live-Steam-Locomotive-Six-Scullin-Disk-Drive-Wheels-/261421299120

The only thing I know about them is that the New York Central 20th Century Limited steam locomotives (Hudsons?)  used Scullin drivers.