Thanks a ton guys! I sometimes worry that I'm getting into way to much detail for it to be interesting to a broader audience. So picking out the differences between the Hand Lasers can be challenging in each of the episodes. And this is to be expected as they are supposed to be uniform pieces of equipment. In WNMHGB both Spock and Leslie (Eddie Paskey) are carrying Hand Lasers, but when Spock draws on Mitchell on Delta Vega his Hand Laser doesn't have the distinctive cavity with the magnets on the side of it... so that was Hero 2. In The Man Trap there is a point where we can see that Crater's Hand Laser has its barrel slightly extended... so that one was also Hero 2. In What Are Little Girls Made Of? it is harder to tell because of how dark it was, but when Andrea shoots fake-Kirk she seems to be holding Hero 1. And in the close-up before Korby/Andrea's suicide we can see the barrel slightly extended... so that one was Hero 2. I don't believe any additional changes were made to the proprs after the second pilot. The Officer's Manual was illustrated by both Mandel and Drexler, so I'm not sure who should get that credit.