Drop the long leg of the Z-probe down the remaining hole in the probe-holder. It should pass through the unused bolt-hole in the effector and just fit past the hot-end.
If necessary, turn the hot-end so that the probe can pass easily and without obstruction and without hot-end touching plastic! Also make sure the cables do not obstruct the Z-Probe. Tighten all screws evenly, but do not over-tighten them or you will strip the tapped threads in the plastic!
With the probe in the retracted (up) position, fit the pen spring and screw terminal from below, compress the spring about 2/3 and tighten the screw-terminal.
Trigger the probe by flicking the short leg past the safety-pin spring into the deployed position and confirm it is pushed down hard enough by the springs to activate the micro-switch - you should hear it click.
Push the probe leg back up past the safety-pin spring and check that it retracts correctly.
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