Those are really good keys.  Mine is a real workhorse around here with the TCS, ARC-5 and the rest of the pile.  It has a good feel and of course, is authentic...  One issue is the flameproofness it is a bit problematic if you need to disassemble it to clean the contacts.  Tiny, tapered pins, precision dowel shaft etc.  Key Guru's advise that should be done by a good machinist with the proper tools (rather than my hammer and files...).  Anyone got helpful hints?   But still a winner around here, it has lots of miles on it...

Tim

N6CC