Never tried , nor have I understood the A.M. white metal gears for WnW kits.
I have built +45 WWI 1:32 planes and never had any issues of bending or flexing gears from any of the original issues from Special Hobby, Roden or WnWs.
To me these particular A.M. items are unneccesary. Better spend money on etch or decals IMHO.
/Mikael