I made a detachable probe that attach with a 12mm circular magnet (The same as the effector for the kossel 800). Due to the circular magnet it always attach at th exact same spot and it is easy to remove without without messing up the new calibration. The detachible probe also saves weight on the effector.
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1x SS-5 omron switch
2x 2,5mm screws
1x 12mm circular magnet
Just glue the magnet if it does sit in place, mine was so tight i didn't need any glue. then screw the screws in place and you are ready to go!