727 shifting into Park question

The shifter button in the shifter handle itself, - if screwed too far in, or not screwed in enuff can cause a limitation of the shifter movement.
It needs to be adjusted so the lever clears and engages the shifter gates correctly.
THe shifter will, when properly adjusted will still allow the shifter to move from neutral to drive without pressing the button.
Folks vacuuming inside the car can easily knock the shifter from N to D accidently, not good if engine running.
My cleanup guys would occasionally do it, causing damage to car and my work benches.
Good luck