Disc Rotor Travel Protector

I made these to protect my rotors when I pack my bike for travel.   There are spacers for both 12mm and 15mm axles.  The black cover piece can accommodate up to a 203mm rotor. 

[Why not a round 200mm shimano?  I digress].  

Pair these parts with some ¼" -20 [or M6?] threaded rod cut to length and some ¼" knobs.  I used red Loctite on the knob on one end to fix it in place.  Let me know how they work for you!