I've seen some poorly translated instructions but this one is a head scratcher. Go to your local hardware store and ask for an "11/14'" drill bit just to see what reaction you get. Also, drilling "1-2/11" deep is too shallow by my measurement. There should have been a retainer nut to keep the plunger from moving once it is set. I'm planning on using a 3/4" bit to drill a 1-1/2" deep hole and applying Loctite to keep the plunger in place. That is what I recommend.
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