http://www.retrotechnology.com/herbs_stu... Try this guy. He may not have it but can most likely point you in the right direction. Also, ask the guys over at the forum 68kmla.org. There are collectors on that site that may want to unload old RAM .
Did you replace both belts? Make sure the capstan belt is on in the correct position. I could be in the rewind position. Not sure that would make the tape just spew out but I would make sure it is in the correct position first.
I am confused. That is one big sentence and only thing I can make out of it is that you are missing a screw....is this correct? Or are you looking for a screw mat? I think both can be had here at ifixit.com. Look under the parts/tools section. Good Luck!