Removing the corrector

Hi everyone,
Last night I removed my corrector in order to remove some dirt from the inside. I made the dumb move and forgot to make a mark on my corrector to show me where to put the corrector back. I was wondering if there are any marks or anything that would allow me to put the corrector back in the correct position. Does anyone have any ideas at all?

Thanks,
Jimmy

Usually there are marks on the plate and tube, Take a look for them. Worse is if you moved or lost any shims for the corrector. Hope you find them, it is critical to get it back into place.
Floyd