This is quote from another forum:
"it can be popped out and realigned, make sure you take precautions against marking the case"
Dont know if thats a fact though.
What comes to dealer pictures.. they allways look perfect..
Yes threads are inside.
Here are part numbers for gen parts (grown and tube) from www.Ofrei.com
The case number of this watch is 178.0514
Crown: 42154, http://www.ofrei.com/page_147.html#9470, $42
Tube: 090ST1237, http://www.ofrei.com/page1115.html#16953 $12
If You mean Rolex sapphire I dont know how it should/shouldnt reflect,
But You can get very nice Anti Reflection coating treatment to Your crystal from Jakub/K2222