-
Yes, those are wire strands poking out of the hole
-
That steel flange prevented the roller from making firm contact with the box and pressing the tape into place
-
They are most assuredly not electric
-
Boxes packed as solidly as possible to withstand shipping & warehousing
-
Which accounts for the very bright incandescent headlamps
-
The evidence certainly suggests ordinary gravel
-
Although it’s technically sandpaper, the effect is more like lapping







