Wrap thread seal tape around all the drain threads and screw into the body of the plug.
5.2 Apply plumber’s putty or silicone to the underside of the flange (the part with chrome trim).
5.3 Push the flange down into the drain hole with one hand, and with the other hand, insert the drain plug body (with its gaskets and lock nut) up into the hole beneath the sink.
5.4 Tighten the lock nut under the washbasin, taking care not to over-tighten so as not to damage the porcelain. N.B.: the plug body has a hole on the side, through which to pass the pivot rod that moves the plug up and down. That hole therefore needs to be exactly aligned with the pivot rod before tightening the nut.
5.5 Insert the pop-up stopper in the plug hole, lining up the hole in its plastic stem with the hole on the side of the plug body.
5.6 Insert the horizontal pivot rod into this hole. Turn the stopper if necessary until the rod is properly inserted.
5.7 Hand-tighten the nut holding the rod in place.
5.8 Pull the stopper to the “open” position; the horizontal rod should now be pointing downward.
5.9 Insert the vertical lift rod into the hole behind the faucet.
5.10 Assemble this lift rod on the perforated extension rod (clevis).
5.11 On the clevis, find the hole nearest the end of the horizontal pivot rod (the rod pointing downward).
5.12 Pass the pivot rod through this hole and block it with the spring clip.
5.13 Pull on the lever to close the stopper and check the adjustment.