Dave Sr. from SWISCO responded:
April 25, 2017
The manufacturer suggest pushing the lock nut around the lever stem with a flat blade screw driver. Just make sure to take your time and push it a little at each side, going around it in a circle. It can be a little tricky to install, though it is definitely possible to do it yourself. If you're having trouble, though, you may want the help of a locksmith to do the job.
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