I recently aquired a set of aftermarket piston rings and installed them on a motor which was being rebuilt. The rings in the package needed minimal filing so I have to suspect that they are gapped from the factory for installation into the standard diameter bore. When installing the first piston, a noticeable resistance was felt from the oil rings. I removed the piston to notice that the oil ring expander was not allowing the oil control rings to collapse to a lesser diameter than that of the piston itself. I verified that there was no expander overlap of any sort. The ends of the expander were butted together and this was causing the oil control rings to not collapse. I am now at the point to where I don't know quite what to do. I don't want to file them, as I may affect the properly intended tension on the oil control rings. My question is basically what should I do? Should the expander allow the oil control rings to be compressed flush with the piston or should they protrude? I know this can't be right to a point because I have never experienced this before and additionally the resistance going into the bore felt like it wanted to break the rings. When I did get the piston in, the drag was quite noticeably increased. What to do?