The reel tables, on the RT-909 are adjustable. There is an Allen head set screw on the rear of the table that secures the table mount to the spindle. There might be more than one, I don't remember. If you loosen the set screws, you can move the tables in or out for the correct tape path.
Pioneer RT-909
I recently purchased a Pioneer RT-909,i had it recapped,new belt,motors rebuilt,etc,my question is does anyone know how to adjust the table,i adjusted the screws on both the supply and take up,but the supply reel winds the tape unevenly,i purchased the rebuild on Ebay,i just don't want to ship it out to Illinois from California again.