Bit of a numpty question... But it needs asking! i'm repacking my Raceco silencer. I've taken it off the car, taken the inlet end cap off, whipped out the old packing, loaded up new packing and I'm ready to reassemble. When I try and refit the end cap, the inlet pipe is fouling on the core pipe and I can't get them to mate... Is is there a simple way to solve this problem? Does the core pipe go inside our outside of the cap pipe? How can I persuade them together? See - told you it was a numpty question, but enthusiastic beginners have to start somewhere! Thanks.