Argh. Cant use stuff like that - you'll scratch the finish !
Will admit it was nerve wracking fitting the DA headset to the best bike.
Normally I'd agree with you, but all my bikes with threaded headsets are still on the original run-of-the-mill headset which already has it's fair share of cosmetic wear. No fancy Shimano stuff here.
When it comes to getting a new headset (if my current ones ever wear out.. they've lasted 20+ years, don't see them breaking any time soon!) I'll be investing in some proper headset spanners to save the finish.