never messed about with the flip top's.
one major ? does the disc break/stop so you can swap with the fliptop in other words do you have to swap in mid spin, a simple circuit would be much better involving a switch that cuts supply to motor power on the main board so no damage i caused to the board.
a simple battery for the motor to eject and insert the tray.
save's getting dust on the lens and it's internal mirrors using the flip top and damaging the cogs doing the slide card method.
and blowing shit out of it using swap chip's.
but as others state just get a mod installed by a pro.
"Light travels faster than sound. This is why some people appear bright until you hear them speak"