My Bosch 1274DVS sander arrived today, and I'm wondering what the two
threaded holes on the left side of it are for? Are these for attaching
things like a sanding stand or fence? It kind of threw me when I looked at
that side with the bare metal, looks almost like it's missing something. But
the diagrams in the manual show the same thing go I guess that's how it's
supposed to be. But what't that angled channel on the same side for? Also,
mine came with a dustbag that attaches directly to the port with a screw
adjustable pressure ring, without any of the framework pictured in the
manual. It seems like a much cleaner, easier setup than the manual shows.
Any info on any of this?

Tony