The problem I see in letting the average "JOE" change crystals is that person not knowing what channel he has at the time of him changing crystals.
So when he turns on his TX he thought that this certain TX and plane was on 36 but he forgot that he changed it to 42, OOOOPPPPSSSS, just shot someone down....................
I have also heard that the new EVO with the synthesizer could be a problem too, capable of tuning your own TX/RX, etc.......

Now with that all said, Have I changed a crystal in my TX/RX.......................

I plead the 5th...............

(can you still plead that????)

IMO

Roger