I took the projector down to home depot and finally found the right thread but not the right length. The both is a M4 x whatever length you need. In my case I want at least 60 to 80mm (about 3").
Yes M4 is what you need... One of the mounting threads on the PJ had to be drilled out since the plastic intruded into the path of the bolt, but using a drill bit ( by hand ) I was able to clear just enough for the m4 bolt.
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