I am going to build a gallows turntable in On30 and was wondering if anyone out there had any plans or know where to find some plans for a spyder for the base of the turntable. I have googled and found a number of pictures but no hints on how to make one. Any ideas greatly appreciated

I recently returned to model railroading and have purchased some (more than wife wants me too) different cars and loco's. The problem I am having is that the wheel sets contact the coupler pockets on the cars that I have recieved. The car example is the On30 camp car (spectrum). I do not ever remember having this problem when I modeled a long time ago.