Finally got around to changing the fluid and filter in my turbo 400 and ran into what might be a problem. The filter is mounted to the valve body by a shouldered (approx 1/2" shoulder) bolt. The bolt goes through an oval hole in the filter. Checked the new filter and it has the same size hole. The filter just swings around on the bolt and the pickup tube. Is this normal? The book doesn't say one way or the other. Someone help me out so I can put the pan back on before it gets dark!