Frank and Group,
I have fitted Sergent couplers to two Bowser Centuries(1-C630 and 2- C636). While none had plows on them I keep running into the problem of the coupler top plate hitting the top of the coupler. The C630 is actually a Stewart in N&W. The C636 are Demo 636-1 and Delaware Lackawanna 3642.
Frank, this was one of the projects I wanted to try the RailFlyer type on and it does not work. The other was the Atlas scale box and that is a bust as well. As far as I can tell we need the narrow shank with the extension the EC87 has.
With the problem on hitting the plow with a F type, I have installed F types in a Athearn Genesis GP39X and a RTR GP40X, both with plows and no problems. This may need the same extension as the EC87 as well.
I would say the extension of 0.100 would be good for both projects.
Frank, I will try and take pictures of the problems with the Bowser ALCOs.
Here is a picture of the RTR GP40X with F and plow.
Rural Hall, NC